Yes, we went into TiVo's offices and they gave us a long demo and had about 6 engineers as well as some marketing people present.
They were very forthcoming except for price and availability (DirectTV get to do that). The unit looked pretty good and was very stable - essentially a production version.
It behaves exactly like a regular TiVo except in glorious HD. You can specify HD only etc. in Wishlists and so on.
It has four tuners - 2 satellite and 2 OTA and you can record (or watch) any combination of 2. Composite and HDMI outputs - no firewire. It does have two USB 2.0 ports that are not enabled and they wouldn't tell us when they would be. The DirectTV version doesn't have the HMO package (MP3s and JPGs).
They were feeding into a Sony LCD projector and a 100" screen and it looked great. Slow motion etc. were perfect.
They fed us and sat around and talked a lot about general plans and some cool things they have planned in the past. Main push now is to get it released.
I can't wait, I hate watching live TV.
Richard