Works fine for me
Well despite all the negative comments on this article, the iplayer worked fine for me.
On sunday night the download speeds varied from 10s of kbps through to 3.2 Mbps... so the Top Gear special I was downloading took an hour odd to download. Two other downloads have been faster. My broadband connection isn't exactly reliable, and I reset it once during the Top Gear download and it picked up from where it left off.
Picture quality is OK, but I wouldn't call it exactly high resolution.
So I think it is a good way to catch up on some missed programme, but hardly a great revolution in the way I watch TV.