Have used my Legend Supreme for roughly 200 dives and it has performed admirably. I have used it everywhere from the cold waters of the Great Lakes to the warm waters of Hawaii and it has been flawless underwater.
My only disappointment is the design of the ACD device - soaking the reguator first off the tank can be a bit dicey if you're not sure the position of the ACD relative to the dust cap...
But that is a very small glitch in an otherwise fantastic regulator. I always recommend AquaLung regulators for their performance and reliability when talking with fellow (and new) divers.
If available, I highly-recommend the "cold water" version of any AquaLung regulator you purchase - for the small added price, you get peace of mind knowing you can dive the regulator in almost any environment.