As
@Eagle_Steve posted there is a huge thread with lots of info on them.
I use lots of cheap lights on my tanks and recently got a few of these. In many ways i like them a lot. The wifi master/slave functionality is great when using multiples and not often found on cheap lights. Definetely more than good enough to grow coral and get the colors you want.
The one thing i really dislike about them and why i likely wont buy more is the inability to have a program that turns off specific channels completely for portions of the day. I like to have the last couple hours of cycle only blue and uv lights. With these i can adjust each channel intensity to get the color mix i want, bit it uses the same color mix the entire day. I can use the sunrise/sunset modes to have intensity ramp up/down over whatever length of time i want, but not able to set it so that at 8pm all whites go off but blue stay on for example. That is what i have found qt least and if anyone can correct me i would be very grateful lol. If that is not a concern for you i would say these are some of the best lights for the $$$ you can buy.