Pros SD slot, nice size
Cons track navigation, no line level output, short battery life
Summary I use a Lexar 1GB-100M SD card.
Pros Great size, works really well with itunes on the Mac - just plug, drag and drop and unplug with the USB (transfers at 2.0 speeds too). Expandable with SD card. Looks cool and was really easy to use/setup.
Cons Record button is on the blitz after only 2 months (and never really using it)! Battery life is a little disappointing.
Pros Excellent sound quality, and I like the SD memory expansion slot. FM receiver is producing great sound. Bought for $50 at JR.com, and it's a good deal at that price
Cons Love to have an armstrap instead of handstrap.
Pros Good quality sounds, Many good features, decent size with SD expension, good ear plug. Only $70 at J&R after rebate. Best value at this price.
Cons SD size limited to 512M and could use AA aize instead of AAA for longer play.
Pros Expansion slot; nice backlight
Cons Weak USB cover; software problems with Windows Media Player 10