It would seem that when they say scale down to 540p and back up, they mean 1900x540p right enough. So not so bad.

Maybe depends on what you’re looking at. Not so obvious on images but text is horrid. Try running XBMC on 1080i and it’ll do your head in. Horrid. Just horrid. On moving stuff with no text it looks much the same, but if you’ve got sensitive eyes, there’s a flicker to the image that drives them nuts. I can’t watch 1080i with my contacts in for instance. Instant migraine.