I have the 2010 ride alphas sitting on a broken DH2 right now. Rode them about ~30 times so far and they are awesome. True all mountain, freestyle capable binding. Couple of things though:
1) I didn't find them as light as most people said they would be. I guess I just had my hopes up.
2) The straps are great. I'm a big fan of rides toe straps. The thin grip ankle really give you great responsiveness to the binding, but without padding, it exposes any points of boot discomfort that cushier straps may mask.
3) They are overpriced, so are really on worth it if you can get a deal IMO
I just got the 2011 390 bosses and only have about 3 days on them with a jib stick, but I love the shit out of them. The ability to customize the toe and heel cant individually really changes the feel. They have the perfect amount of flex but YMMV. I don't really have any cons because we're still in the honeymoon stage.
Evo | 390 | Kaiju