I had a Cowon C2 16GB player.
It had decent sound quality and loads of sound effects but the software and the touchscreen was very very buggy.
It went back to Amazon after I got terribly frustrated with the missed touchscreen registers and hung screen.
I would suggest stay away from the touchscreen models as Cowon is still not there yet.
How do one compare J3 with iPod classic (V5 or less)?