Well in case anyone is wondering what I ended up deciding. I first scheduled to get a 722 upgrade based on the feedback I got from people, but at the last moment I said screw it, and switched it up for the 922. It's been a couple days now and I must say I'm glad I did.
I currently have my 922 hooked up to 3 TVs - 1 hooked up to TV1 and the other 2 hooked to TV2. I definitely like the remote for it much better. I was never able to program my 622 remote to control my TV2s due to lack of codes - but with the 922 and it's learn functionality it was pretty easy. I manage to talk Dish into sending me a second remote for free since the 922 only came with 1 (I use a Harmony 890 remote for TV1).
Sling didn't work initially on the first day - ended up talking to Dish Tech support and they had to update something on their side, and by the next day I noticed it working. Seems to work pretty good - even with my iPhone on mobile internet. I was finally able to retire my old setup using Orb (Free Sling-like software for your PC) connecting to a Dish receiver and an IR blaster. Although Orb ran pretty decent, Sling blows it away.
Another great thing is I can now get to PlayOn (for Hulu) right from my 922 - and it actually runs better then it did from my PS3.
I also must say that I really like the 922's UI. I haven't really noticed any issues so far.
I did manage to get a pretty decent deal when I signed up. The receiver was $200 but I got $10/month off for a year ($120), Free HD for life ($10/month savings), waived Tech appt. ($90), upgraded dishes, plus a free second remote ($20).
For those people who are looking to upgrade to a 922 and want TV2 hooked up, here's a warning - the installers are pretty clueless about it. He told me I could not do TV2, even though I tried to explain to him that it was in fact enabled in the last firmware update. He even ended up calling it in to the office, and they said the same thing, that I couldn't use it.
So I gave up and let him install the 922 on my TV1 and move my 622 for my other 2 TVs. Then as soon as he left I disconnected the 622 and connected those TVs to the 922's TV2 - worked like a charm as expected. Now my 622 is on it's way back to Dish...