I like my 322 a lot (Ebay purchase), and Dish did not have a problem activating it for me (same goes for 522 I bought). BUT, I do hear rumors that may change, so I would call Dish first before buying one, have them note your account that they will activate a 322/522 if you buy one.
As far as the receiver goes, it does exactly what it supposed to do, give you total control from 2 different TVs from one box. The newer software used in the 322/522 is a great improvement from other Dish receivers. I actually like it better than the 921 software.
The only problem/issue I noticed with the 322 is that the screen will go black every 2-4 hours by itself when no user input is taking place. Simple channel up/down brings it back. I have talked with advanced tech about this issue and it is being "worked on". Once this glitch is fixed it will be as stable as a 301, but much more advanced.
1 and 1/2 thunbs up from me (will be 2 when glitch is fixed)