I have been using the Biling solar birdbath fountain for a couple of weeks now and am generally satisfied with its operation. A couple of things to keep in mind: First, it took a day or two for it to settle down in its operation. The day after its first day of use it did not seem to restart in the morning. I had to go and "play" with it for a little while to get it to restart. As the meager instructions specify, you have to keep it completely in the dark for a couple of minutes, then expose it to the sun. The small pump motor should then automatically start, and you need to put it in the water to get it to start pumping. The pump motor will turn off after a couple of seconds so you have to be quick to get it in the water. Also, the pump makes very little noise or vibration so it is difficult to tell when it is on, so I had to play with it a few times before I got it in the water and pumping. Since its first day or two, the pump has started when sunlight starts without any intervention on my part. Next, the pump is almost too efficient. The birdbath I am using is small (only about 12 inches in diameter) and it has a 6 or 7 inch deeper area in the middle where the fountain unit would sit. However, when the fountain is pumping, it would pump out the water in the deeper area and would come to rest on the surrounding shallower part. The pump was so strong that it would create a suction that would clamp the outer diameter of the fountain down on the shallow part of the birdbath, with the result that it would pump out all the water in the middle and turn the motor off for lack of water. There were three tiny "legs" on the pump which presumably would keep the unit up off the floor of the birdbath enough to allow water to flow, but the "legs" weren't nearly tall enough. I removed the legs and glued three plastic bottle caps (using aquarium silicon cement) to the outer perimeter of the fountain unit to lift it far enough off the floor of the birdbath to keep the water flowing. Another thing I've observed is that the intake of the pump does require fairly frequent cleaning, perhaps every third day. I use an old tooth brush to scrape off the filter intake, and the pump has been operating smoothly. I wonder if these three items above, or perhaps a combination of them, has contributed to the several reviews here that have complained about the pumps operation. As I've said, once I was aware of the above, I've had no problems in the several weeks I've had the solar fountain so far. One last thing to keep in mind is that this is a small unit. If you're looking for something that would squirt water more than a few inches up in the air, this is not the unit for you. We live in an arid climate, and there is lots of evaporation and wind. I've been using the pump without any of its nozzles to cut down on the evaporation. Without any nozzles it shoots a solid column of water (maybe a quarter-inch in diameter) up about 2 to 3 inches above the outlet. On completely calm days I do sometimes put on the nozzle to give more of a spray, but I don't use it too long due to lots of evaporation. If there is any wind at all there is a great tendency for the spray to be blown beyond the edge of the birdbath, greatly increasing the water loss rate. We have had a couple of birds use the bird bath over the past several weeks (which is near a set of well-visited bird feeders) and believe the usage will increase.