I bought a 4gb D2 last June and replaced it with a 6th gen 120gb iPod Classic the first week of December.
I love the touch screen interface, lossless playback, LONG battery life (I could get about 15 hours of listening before battery level read 1/2), drag and drop, low cost, sd slot, etc.
About mid July, the up button no longer clicked when pressed. I contacted support, I sent it in, 2 weeks later I had it back and the button was like new. A week later, the button was hosed again. Back to support and no tunes for two more weeks. Second time back from support, the firmware was cleared, and the screen protector (the one included at purchase) was gone. Plus, the unit was placed incorrectly into the box so there was some plastic rub marks on the screen border. This is now late August.
A few times I had some trouble transferring more than a couple folders at the once. Literally I would have to drag 3 at a time or all the tags would be fooked when properly disconnected. This would happen whether moving to an 8gb SD card or the Cowon memory. All folders would have to be deleted, then the firmware reloaded. Not a major deal, but time consuming. I ended up not using the Cowon memory as much as it went back to support.
Was about to go to work in mid November and the screen has a geometric pattern on it. Support said to send it in again. 2 weeks later it is back and works fine. At this point I am fed up. 6 weeks at service is too much. MULTIPLE resets of the firmware. I must have bought a lemon.
When it came back that time, I sold it. 4gb D2, silicone skin, 8gb sd card for $80. I paid about $180 through Amazon for all of the separate pieces.
I was not happy with support overall. They forgot punctuation a lot of the time. I didn't know if they were asking a question or making a statement. I always left feedback for them. "Please work on grammar and puncuation. Thanks." Oh well. My iPod and I are very much in love.