When they work they are great. I have like 12 of these and "most" come on at night and stay on a few hours - not all night like I was expecting. The next day a different set of lights will come on. If you manually turn them off and back on they work great and are very bright but I shouldn't have to do that.In the company's defense I did email them and they responded promptly, which was unexpected. I just didn't feel like going through the trouble of all that was required for a refund.Like so many cheap things bought online you never know what you're going to get.