From what I hear it's a nice fixture, I just don't understand why they opted not to add the active cooling system to the T5 only fixture like the did the with MH/T5 combo fixture. Surely they know what the benefits of the active cooling system would bring.
An easy way to mount it in a canopy would be to add some wood support pieces to each side of the canopy for the ends of the fixture to rest on.
Personally I'd go for the MH/T5 combo over the T5 only fixture. If you do decide to get an IceCap, that is.