I just installed two on my tank and like them so far. They seem to provide a more concentrated beam of light compared to the square reflectors.
In the pic below, the Aquaconnect bulb is installed in a square 22"x22" LumenMax and the Reeflux is in the Lumen Bright reflector. Granted the Reeflux is a 10k so it is going to be brighter but you can also tell how concentrated the lighting is compared to the one on the left.