So I upgraded to 5.00 M33-6
-You can't see the XMB (It's all in the corner of the screen)
-The gameboot is too long and it loops a little
-It makes going back to the XMB from a game really slow
-It flips your preview pictures of your games (yeah, more detail below)
The last one is weird. Not only does it zoom in more than usual, it flips the preview picture! I confirmed this just by looking at the text from Viewtiful Joe and Force Unleashed. I'm considering downgrading back to 4.01 M33-2.