DJI's customer service is notoriously horrible. Fortunately, this Mavic is running well, so, it's not been an issue on this unit (I've had numerous problems with two different P3s and an OSMO).DJI seems to want to become a world-class company like Apple or Sony, but draconian firmware updates and mildly buggy apps show that DJI is still far from that goal. The notification that accompanies the firmware updates suggest that they are willing to shut your equipment down, or limit its capabilities unless you submit to their updates. Your very expensive flying camera can be disabled at DJI's whim, and who knows what they are doing with the plethora of data they collect every time you use your UAV.This aircraft is well-made, but the software that controls it will let you down about 1 time in 7 flights, by my estimate. When it works, it works really well, but when it's whinging about compass calibration, or sniveling for an app update when you're far from an internet connection, you're in for a bad time. The forward sensors are problematic, they cause jittery flight and endless alarms. The bottom sensors work pretty well and allow for some soft landings. Sometimes precision landings are very close, and sometimes they are off by 10-20 feet.That's the problem with this ship...you simply can't count on it. If fortune is smiling on you, the system will work well. But you just don't know. Sometimes, the DJI GO 4 app will just shut down, mid-flight. iOS app or Android, doesn't matter, they both crash. Disable cache, or not, the app will crash more than occasionally. Your butt will pucker until you get it running again. Most people fly farther than they can control the craft by sight alone...when the GO 4 app crashes, you're basically blinded. Most of the time, you can just let the bird just hang in the sky until you reestablish a link with the app, but this could also be unsafe. I keep the craft in sight, but honestly, when it's more than a few hundred feet away, it's tough to tell which direction it's facing by sight alone. You do little maneuvers to figure it out, then you can come home. It would be great if they could just fix the buggy GO 4 app! I keep the tablets I use for the Mavic clear of anything but the flight apps. Plenty of memory, no internet, no games, comms, or other bs, just DJI stuff...and GO 4 still shuts down in flight.Understand these things about the Mavic -- Oftentimes the Mavic is exhilarating...occasionally, it's infuriating. Don't count on it. Be careful. It can be dangerous, even when you're careful...but it's especially dangerous if you're careless. No matter how good a pilot you are, the machine can screw up, don't take chances with other peoples' safety.Before you go out to fly...like, *moments before* you go out to fly...get everything running in your house/office or wherever you have a strong internet connection...get everything running, make sure all the components are up-to-date, and actually hover a foot off the floor. Then land, take it all apart, go to where you're going to fly, and pray that some update isn't required before you actually get airborne again.It can also help you make some really pretty pictures... Good luck, fly well!