So by now we've all lamented on the lack of a high definition GUI for the THR22. We've all asked "Why couldn't they make the HD GUI from the Premiere work?" Here's a simple answer for that. TiVo's HD GUI is a completely different, Flash-based software. This requires significantly more powerful hardware to run the UI effectively. The TiVo Premiere and Premiere XL both use a 400MHz Dual Core CPU, about 2.5-3x the processing power of the Series 3, and faster than the HR22 platform (and even HR24 platform) [could somebody confirm this, I can't readily find the CPU specs for the HR2x right now]. Also, being a completely different programming language, the software would be significantly more time-intensive to port over than utilizing the base software from the previous-generation DirecTiVo DVRs. No, I don't have any inside information on the actual reasons (I wish I did); but reading around, this would make the most logical sense.