Got my 921 Thursday, double boxed to protect it during shipping. Set it up yesterday without a single problem . Biggest pain was adding the second SW64 switch; looks like quadruple bypass surgery in my attic.
So far so good. Recorded a few shows no problem . I like the guide and menus. Picture in HD is fantastic, a few notches better than than my 6000 I think. Still trying to sort out whether to watch SD from the HD output or s-video . I'll post a new thread with a few questions about that.
All-in-all, I'm very pleased with the 921 (and Dishstore) but I'm keeping my fingers crossed .