Tivo Desktop does not work the same way as PyTivo does, and has more features, such as push, which does not do much transcoding as when you pull from playlist.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!