We have three 622s sitting in the closet, but we certainly cannot use them in any form or fashion without Dish Network service. Anyway, just a few additional notes:
1. This comparison really should be between the 922 and the Tivo Premiere since the TivoHD is now an outdated model. The Premiere UI adds several enhancements, but the new UI is also slow due to one onboard procesor being disabled because of stability issues...which will hopefully be corrected soon. Personally, I love both the VIP and TivoHD/Premiere models but, as others have pointed out, it really is an apples to oranges comparison since both products cannot be directly compared.
2. Recording/Search/Season Pass - all go to Tivo. To be honest, I experienced very few problems with the functions on our 622s and, from what I have seen, the 922s function very similar. However, all my Tivo recordings and scheduling conflicts have been 100% reliable.
3. TivoHD/Premiere has only two tuners. While this is not often a problem, it is sometimes highly annoying when there are three shows I wanted to watch/record. I am very disappointed the new Premiere model didn't include a third tuner since the new MoxiHD also support three tuners.
4. Web Access - the Premiere model fully integrates guide and search data through the web. For example, search results can include video from Netflix, Youtube, Amazon, etc. and is configurable. It's really pretty slick, but once again the new UI is slow due to the disabled processor issue coupled with the fact its new Flash platform needs to be optimized. Additionally, Tivo recordings can be scheduled through their website and there are Tivo iphone apps. Plus, I have my Slingbox Classic connected to my Tivo and can access it from just about anywhere.
5. Tivo service can be used just for OTA ($10-12 monthsly subscription) whereas you'll need to subscribe to a Dish Network program package with the 922. The TivoHD/Premiere is the preferred option for those wanted a premium DVR for OTA only. Of course, there is always the DTVPAL DVR without subscription fees, but it doesn't do name-based recording and is certainly not in the same class as a Tivo or 922.
6. The Tivo Premiere is far more energy effieicent than a 922. It uses 26 watts vice an estimated 50-60 for the 922.
http://www.satelliteguys.us/dish-network-forum/209060-another-hidden-5-month-dvr-cost.html - yeah, this isn't a user experience issue, but this could be a significant factor if you have three or four DVRs in service like we do.