Not seen one but it will surely no different to plugging in an ordinary PC/Laptop and setting the iPlayer to full screen. You're right, it's no freeview but it's very watchable. Unless you're the sort of person that buys a new television every 18 months or so I would be quite cautious about getting a set specifically for this type of facility, considering how many times has the BBC changed the way the iPlayer does things in the past year I wonder if any firmware updates will keep pace. It may be a bit more fiddly but I think I'd rather have a standard television and a laptop with an HDMI output.

Via Nintendo Wii or Playstation 3 (you can also get c4 and five shows via youtube on the PS3) You can watch in a window or full screen. Qualitys not far off freeview standard.

are supposed to be selling them exclusively for a while. I think we will see more and more TVs like this in the next year. I also read that Freesat is supposed to be offering an iPlayer channel or something.