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I've got one on my Legend LX first stages. Never any problem with it. It does occasionally free-flow when entering the water. No big deal to me, I just turn the mouthpiece down. I like the reg a lot, lower profile and a user can breathe off it in either direction (there is no right-side-up).
I owned one briefly. Its fine for the "normal" octopus-type openwater configuration. If you ever go to a bungeed backup or the long hose system used by tech divers and some rec divers, its not going to work. It depends on your goals I guess.
The Egress is much nicer than the Aqualung ABS, since the Egress is a balanced second stage.
John