I have the 48" fixture and have used it for 3 years. I like it because its affordable it has individual reflectors and its a compleately sealed unit. IMO the plus side of the fixture being sealed is that no salt will get inside the fixture and corrode wires or conectors. The downside is that because its sealed and it has no fans it tends to run kind of hot but not to bad. I the summer I use a clip on fan to push the heat away from the tank. Other than that this is a solid fixture. I would recommend it, I have a mixed reef SPS, LPS, & softies. If you do get this fixture I would replace the stock wavepoint t5's and go with the ATI's. There bulbs are ok but ATI's are much better.
Good luck