I bought one of these boxes from ebay the other day, saving about £100 from retail and avoiding any BT/Talk Talk contract. Thought I would share our experience.
Until now we have had Virgin Tivo (HD), which is the slowest buggiest box I have ever had the displeasure of using. It seemed worse the fuller the HDD became, for a reason I cannot comprehend.
So far it is brilliant, fast and smooth with a far more intelligent layout. Most importantly, it is free! :)
Feels like a breath of fresh air in comparison.