I'm using a Zen 20GB sleek photo..
It has been good to me so far.. bt the time I bought it I didnt hav Windows Media Player 10 installed so it was not recognized..bt I then updated to WMP10 & it worked like a charm..
It has decent user friendly menus, can create your own custom EQs, good sound quality & can configure to use a part of the 20GB as a USB Pen drive.. (Ex- I hav diveided 11GB for mp3s & 9 GB as a hard) & u just hav to plugit in to your PCs USB port & switch to Hard Disk mode & it works like a Flash Drive....
On the bad side..the menu sensitivity is a bit too much..u can ajust it in the menu though, bt will get a bit of getting used to... also I've found that dust seems to be accumulating under the screen..u cant remove the display screen so its better to get a dust jacket with your player...
hope this helped...