I've been using this product for a little over a week now and am quite satisfied. With that said, lets get into the full review:The Good:1. The collar unit is advertised as being waterproof which is a huge plus considering I'm from New England which is very wet for about 2/3's of the year! Unfortunately, I haven't really put the manufacturer's claim of being "waterproof" to the test other than using it in some light rain, but so far so good. Short of having my dog Henry jump into the pool with the collar on, I'm not so sure I really want to find out if it's truly waterproof all that bad! Lol. But I'm sure it would probably work fine as the charging port and pairing button port are both plugged with rubber tabs as you can see from the pictures in this review.2. The product is advertised as having a 300 meter range which is great! It's a comfort to know that it has quite a reach for when I need it!3. The blue glow display is very easy to read and straight forward. The operation of the remote is very user-friendly and intuitive. Once you read the instructions on how to use it, it's not something you'll ever forget. It's just super easy! However, I would certainly STRONGLY suggest that anyone who is buying a shock collar for the first time and/or are first time dog owners to read the ENTIRE instruction sheet as there are some good (and rather straightforward) training tips to help dog owners not needlessly abuse a device such as this that can be more harmful to your pet than good if you don't know what your doing... So please, anyone that's new to these, PLEASE PLEASE do some reading up on how to properly use and train your pet with this type of product. This is NOT something you want to be very cavalier with.4. The nylon collar seems to be of relatively good quality and construction. My only concern is the plastic clasp. It's rather small for the intended size of dog this collar is aimed at training. My Yellow Labrador, Henry, is 75lbs and when he begins pulling on the leash, I do worry that the clasp could potentially give out eventually.5. The device is packed with a number of useful features including: a fob style light for finding car keys at night etc., a red-light beacon mode that causes the receiver on the collar to flash a red light to aid in finding your dog in low light conditions. There is also an audible beep mode which allows the user to track their dog's location by sound. And finally, you have both a vibration correction mode, and a static shock correction mode. From my personal experience, the vibration mode seems to be perfectly adequate 99.9% of the time. I try to avoid using the static shock as much as possible because frankly if there's not a need for it, and the vibration mode works just fine instead, there is no reason to cause my pet discomfort. After all, the entire point of this collar is to train your pet, not as a punishment tool.6. Both the vibration mode and static shock mode have adjustable intensities ranging from 0-100. Adjustable intensity is always a good thing so that you are able to use the LEAST amount of intensity necessary to correct behavior. Once again, the aim is to train and encourage compliance, not punish.7. The unit also comes with a second set of replacement collar prongs in case the default ones either get damaged, too dirty, or what have you. I would definitely recommend using some rubbing alcohol and a cloth to periodically wipe the 2 metal contact prongs, both to keep them clean, and also keep it sanitary for your dog.Overall a great product so far, and for $35 I would certainly recommend this to everyone.And now the bad:The Bad:1. While both the charging port and device pairing port have rubber plugs, unfortunately they are located on the side of the collar underneath where the nylon collar runs. This causes the user to constantly have to remove the collar from the unit to gain access to the charging port which is quite annoying and just a poor design flaw in my honest opinion. I understand that the goal was to keep the charging port and pairing port out of the way from anything that would possibly disengage the rubber plugs from protecting the ports from water, but still... It's rather annoying to have to keep removing the collar from the unit to charge it.2. While the remote works great, it was not designed to be very durable. Frankly, if this fell out of my pocket on to pavement, I think it would break. Bottom line, this remote is NOT impact resistant at all.3. As stated earlier, while the collar is made from an adequate grade of nylon material, I have strong reservations as to how long the plastic clasp will last before giving out.4. When it comes to electronic devices, I'm all about longevity. I use flashlights all the time, and would rather spend money on a nice rechargble flashlight like an Olight, Surefire, Streamlight, etc. and have the comfort of knowing that not only is the device rechargeable, but once the battery finally dies, I can purchase another one, and be good for quite a long time again. Unfortunately, that is not the case with this device. Neither the collar or remote seem to be designed to replace the battery. This means once either the collar unit, or remote stop holding a charge, you are going to either be forced to attempt to contact the company and mail the product in for service (at a cost I'm sure!), or just simply purchase another product. I don't care for that kind of design. I would have rather seen this product utilize a common lithium ion rechargeable battery so that this product could potentially last indefinitely.5. The audible beep mode is not nearly powerful enough to hear your dog beyond approximately 30 feet away. Beyond that, you're probably not going to be able to hear the beeps anymore... So while it's a good idea, the execution was severely lacking, and unfortunately makes this mode have VERY limited use.6. While having an adjustable intensity for both the vibrate and static shock modes are a great thing, having the ability to adjust the intensity literally in increments of "1" from 0-100 is OVERKILL. Having the ability to go from 39, to 40, to 41.... and so on up to 100 is just ridiculous. It's completely unnecessary to have 100 intensity options. It would have been more practical to make the intensity meter go up in increments of 10 than increments of 1 on a scale of 0-100. It's just silly.7. Lastly, the blinking red light beacon mode on the collar is not very bright or eye catching at all. In fact, unless it's nearly pitch black, you're probably not going to see it at all. You can see the red light in the picture I've taken displaying the remote next to the collar. Ultimately, I would have liked to see a much brighter light that would catch the user's eye from a distance. After all, this mode was intended for the owner to locate his pet at night.Conclusion:While some of the features are either impractical, or maybe even poorly executed in some instances, the device works great where it counts the most. And while having a non-replaceable battery construction and a non-drop resistant remote are definitely hits to this products overall design, it's still a great product at only $35 and will certainly accomplish your goal of training your beloved dog! Recommended.****UPDATE 5/4/2017*****I've only used this product for a couple weeks now and the D-ring to which you connect your leash to has broken. To my utter surprise, this D-ring is made from plastic, NOT steel! Completely unacceptable... Clearly the electronic portion of this collar is designed for larger dogs, and the instruction provided with the product explicitly instruct the user to not use any other collar with any metal parts while using this e-collar. How in the world this company thought it was a good idea to make the D-ring from plastic and not steel is beyond me. I'm very unhappy and am just extremely greatful that my dog was not near a busy roadway when this collar broke! I also went to my local pet supply store to see about getting another identically sized collar to replace the one that comes with the product, and it seems this collar falls somewhere directly between a small dog collar and a typical large collar. So no luck finding a replacement collar with a PROPERLY constructed D-ring to hook my leash to. I will certainly be contacting the company about this. Update to follow as soon as I find a resolution.As a result, I'm amending my review from a 5-star to a 3 star. After all, this IS a "training collar", and constructing an essential part of the collar like the D-ring that you fasten your leash to from plastic is just nothing short of idiotic! BUYER BEWARE!UPDATE: 5/8/2017I contacted iTronics through Amazon and they stated that users are advised against connecting a lead to the e-collar because it will put excessive pressure on the electronic contacts. They instead advise to use a secondary (non-metallic) collar if you want to have your dog on a leash while wearing the e-collar. iTronics was willing to ship a new collar at no cost. Very good customer service. I will amend this review to 4-stars because of the customer service.