Even Scott recommends sticking with a 722 and Sling. If it aint broke, don't fix it. In your case the only reasons you would want to upgrade are the following:
1. additional OTA tuner (2) with the purchase of the MT2OTA module.
2. DLNA support
3. 3D support
4. Fancy UI with color channel logos and cover art tiles for TV shows on our DVR, etc.
5. Extended program info for many programs and movies.
What you will be losing with a 922:
1. No Manual Timers can be set at the 922 box; you may do so at DishOnLine.
2. No DishPass, to my knowledge.
3. Cannot re-name OTA labels (if this can be done on a 922, please let me know).
4. Easy navigation of UI: The 922 navigation is cumbersome as it was designed for a moue-pad and trigger remote that was abandoned for traditional remote that know makes it somewhat of a challenge to navigate compared to earlier ViP's, and NO number menu options to quickly get where you need to go.
5.Large characters and numbers: Ironically, for all that eye candy, the picture in guide/menu is significant smaller; the text is smaller (no way to set 1 1/2 hour guide, for example); when in the guide, the channel numbers on screen and channel ID are smaller; the logos could be larger; even the cover art tiles can be hard to read. In general all the characters are smaller, although in true HD, so more clear, but that really doesn't make-up for the small letters and numbers.
There are a few other irritants to the overall UI compared to the earlier ViP's that I can't recall now.
Overall, the 922 UI is good, but it is quite different from the previous ViP's and if your eyesight is good or you have a REALLY large screen, then you should be able to read the letters and numbers well enough. If text size easy to read is important, then the 922 isn't for you. All Dish really needs to do is provide and option for larger text and display, and they will have fixed half the negative experience. The other half is to make access to menus less cumbersome and a 922 would score a 100. I would indeed recommend a 922 for new subs (no legacy or easier to use ViP's) and those who would really appreciate the channel logos and cover art tiles. I'm glad Dish is going to make this the interface for the future because it is good, but just a bit to small or hard to read for many.