I am going to disagree with Jimbo, the TIVO wasn't broken, Directv thought they could do it better, they couldn't. And I don't see how it could have been cheaper, with all the software and hardware changes that has been done over the past year and a half.
Recording two programs and then trying to switch between is a poor way to try to emulate a feature. Omitting DLB was a HUGE mistake. I don't think the hardware is capable of it. Just my opinion.
One thing I DO agree with Jimbo on. It certainly has lots of features. 90 percent of which you will NEVER use.
While I had mine ( its gone now, thank God) it was a totally underwhelming experience next to my HD TIVO. I cannot think of a circumstance that I'd have a HR20/HR-21 back in my house. They even aksed me what it would take to keep me. Easy, an TIVO that would work with the new HD. I told them if they ever swallow their pride and accomplish what should have been done in the first place, I'd be willing to give them my money again.
All that said, if you want D* HD, and you want to DVR it, get used to the idea of the HR20/21.