Quite a bit I'd say! I just came across this review of Cowon S9
From what the dude has written, I'd say he hardly has any idea what he's talking for better part of the review. And in the end he says that the video quality on S9 is second to iPod Touch & shows a picture of iPod Touch & S9 with videos on their screen & says that iPod's screen is a bit more crisper & shows better than S9. Anyone can say he's blind after looking at the accompanying photo, the iPod (at top) has much poorer screen than the one S9 is showing!
And I just wonder where do these people keep their brains when reviewing stuff about which ofcourse they dont have any idea!