Dont know about the rest of you but my main gripe with MP9 is the way it handles full screen mode. when you move the mouse these two over sized bars move in from the top and the bottom of the screen and resize the video to accomodate themselves. on MP7 & MP8 (Is there a differance between those two?) the bar is much smaller and doesnt resize the video to accomodate the bar. ive also noticed codecs seem to occasionally delete/currupt themselves when using MP9, something I have yet to see happen with MP8. It annoyed me no-end when I found out MP9 is a compulsary component of SP2
It annoyed me so much I didnt even bother setting up MP9 on my laptop, I just went straight to Winamp5, wich I have been holding out using for the same reasons bifta said, though this time it seems solid as a rock.