...but a helluva step up from the 21 series when it comes to speed.
Hmmm.. I have an HR21 and I don't find it slow. Once in a while, it waits a second (mostly when scrolling the guide through those PPV graphic channels), but in general, it's not frustrating. I'm using an external 1TB SATA drive so maybe that helps?
My mother's RCN cable box/DVR, on the other hand, is atrocious. I was using it last night and was ready to smash it within 2 minutes.