I had many problems with 2.2.1, read some threads, downgraded to 2.0, and while I miss some of the functionality, at least it sort of works. Still some bugs (Sonar's audio engine has to be restarted while browsing presets often), but no crashes so far...
Also, had a broken key, but Guitar Center swapped the controller out for me, no problem.
IF you want one, better hurry, they are running out of their clearance stock, at 249 USD.
