Very good set-top-box for receiving FreeSat channels, problem free operation (the reviewer above who complained about lip-sync issues fails to consider that this could be due to their display rather than this box), and compelling features.
Picture quality in extremely good, especially if you select 'Original' as output format which means SD channel's 576i is output as 576i and HD channel's 1080i is output as 1080i which enables the best quality from most displays -- this is in contrast to Sky HD which forces 576i out as 576p and looks poor in comparison. Although you can still force everything to 1080i or 720p if you so wish.
Audio quality is good as this set-top-box can present Dolby 5.1 over HDMI, which Sky HD cannot (you need to use optical output for that, it only does stereo over HDMI).
Internet TV is fantastic, the BBC iPlayer is now available on this device if it's plugged into a home broadband network. Two resolutions are offered 'Watch Now' and 'Higher Quality', if you have high speed broadband then 'Higher Quality' is approximately same quality as FreeView. It is brilliant, and the best implementation of iPlayer yet.
The user interface is really easy to use with clear and friendly graphics, the SD ones are anti-aliased if you output 576i and if great in 1080i -- it looks miles better than Sky's.
Setup is dead easy, if you are a Sky HD subscriber you can simply run another cable from the Quad-LNB to this box; although two of my friends have bought these boxes where they have moved into flats/houses where previous occupants had left a satellite dish.
The only downside is that there are currently (April 2010) only two HD channels available -- BBC HD and ITV1 HD -- however Channel 4 HD, E4 HD, and other HD channels will be 'free to air' once their deals with Sky expire.