Maybe there's a few hundred ms lag but it's a non-issue for me.
its awesomeness more than make up for its small lag
I'm not even sure if it's really laggy. I have to test it on my PC and then compare with the same skin
...OK, just tested it now on this PC (a modest Phenom II w/ 4GB RAM) and the UI has almost instant navigation, while the Pi has, I guess, 500ms or 750ms lag
But being able to use my TV remote is more important than a small lag IMHO
what really annoys me is the lack of codec support on the Pi
Being unable to play some file formats =/