All of the 922 owners are beta testers. They just aren't categorized as such.
Back when I had a 721, I was an uncategorized beta tester as well. Now, there was a 721 bug that I was indeed a real beta tester for the fix and the group of software engineers that controlled that test were very thorough and receptive to feedback. In fact, they hounded you for it, so it was at the very least, important to them back then.
About the only boxes I've ever thought that were release candidate at launch were.... The 501. It was a very stable box. The 522 and the 722K have been great as well. The 722K has some 'bugs', but they have been annoyances more so than show stoppers.
Every time I glance over at the 922 support forum, I wonder why anyone would pay $200 and get in bed for 2 more years to beta test software. I would be surprised if that box is as solid as the 722K in the next year.
Now, on topic, they won't be updating the 211 DVR software anymore unless a major bug is found in the non-DVR function.