IMHO, those lights are fricking awesome (the blues). They add great shimmer and the fluorescence is incredible! In terms of aesthetics I feel they are absolutely the best. I bought four but had to return them and am so disappointed that I couldn't make them work. The issue I had was how narrow the beam is on the LEDs. I just couldn't make them work on my tank (92 Corner) as there wasn't enough room and I couldn't get coverage around the Halides and T-5s because of the narrow beam. They would have worked perfectly if my tank was long though. The crispness and color of the light is soooo nice. Get them and you won't be disappointed. I seriously think not being able to get them to work for me is the biggest disappointment I've had with my tank.
You'll probably need more of the modules than you think, just an FYI.