My slingbox 500 is driving my Tivo HD box. Picture is great but the control of the tivo really sucks. Lots of lag such that I'm always overshooting my fast forwards. I would have thought that the control functions would have a higher priority than the video. I know its possible to work if the software sets the right priority for control because my iPad Tivo app has nearly instantaneous control over my tivos. I've also got the slingplayer for my iPad and has the same lag problem as the standard browser client. Very frustrating.