Yeah, us existing users are for the most feeling slightly underwhelmed. It's hard to possibly comprehend as the 700 gear does work ok under X2, it's just not a full integration and you get reasonably frustrated at the interruption to your workflow when wanting to control plugs and the like as one example. Silly....
We are now up to X2 and the 700 gear is left behind, that is an accurate comment... so I am not sure I would be pulling the trigger just yet. If you are intent on a hardware interaction as part of your creative process that is not confined to a mouse, then you may want to consider ALL the other options. This is indeed a damn shame as the Sonar platform has been excellent (in the most) for a long time and I believe it is still hard to beat....err, unless you want a full featured control surface.
Cheers.