I purchased a pair of these recently.
I have a pair of A900Xs right now and I promised that would be that for my desktop gaming sessions. However, curiosity got the better of me.
I have no real interest in using these for music, pretty much only for competitive gaming. I do hope that their performance in this regard (as well as comfort) is an improvement over the A900X.
I've only briefly demo'd the A900X, but I can say the W1000X are quite comfortable for gaming, and that they're (imho) a reasonable improvement over the A900X. That said, when it comes to gaming audio there's very much a "break point" where spending more does not improve performance that much - in terms of accurate positioning and hearing various cues, I'd honestly say that the Bose AE2 are no worse than my electrostats or the W1000X.