I just got this from Jetaudio (through amazon). It's replacing my sansa fuze for Gym use.
Overall, I'm very impressed, even though I am not quite up to speed with all of its UI quirks. The sound output dwarfs that of the fuze. I've never used a cowon product before but i've been reading about them here and other places for years. I'm suitably impressed, even though It will take me a while to get the perfect setting that will work for all my songs. I think the player may be a bit to much for my ksc-75's i've been buying for years.
A few problems though: Dedicated physical buttons for track up or down would have been great. YOu can remap the volume controls but I like those to have dedicated buttons as well. Speaking of which, I wish there were some dentation on the volume rocker so i could find it when its in my pocket.
The major problem: Scrolling is a pain when there are massive amounts of files. Scrolling with the fuze and the scroll wheel was easy. The C2 is nice and smooth, but it's IMPOSSIBLE for small, fine movements. It's especially a pain when there are small on screen buttons around the corners, like PREV or NEXT which are too easy to hit accidently. I can't use a stylus because i'd just lose it at the gym.
I also do not like proprietary cables.
Microsd is great for me because I have a 32gb one i was using for my fuze. the card has about 20 gigs on it and the C2 takes a few minutes to read it all. The fuze would take an hour or more. That's some improvement.
I can't add much on the audio quality front because I'm not as expert as some of you. But the range of tweaks available is truly staggering.