vista's windows media player 11 >> once you FF the sound goes away on avi/mp3/generic rips
mediagate 350HD >> the second you FF/RW the screen freezes.. for several seconds once playback resumes the audio/video is out of sync.
truth be told I have no idea what it is...
I just installed a new fireware on the mediagate and the avis perform better now.. but there is still a bit of a sync issue if I perform anything higher than an 4 X FF.
the size of my avis generally run in the 1.5 - 2 GB range