There's been some problems with them. The first I had crashed and wouldn't restart properly so I had to take it back. The replacement so far has been fine except it seems to play albums in reverse order. If you buy 2nd hand then make sure you get a receipt and it's still under warranty.
Alternatively you could try Ebuyer (they've a good looking Sumvision one for £30) or Tesco - technica £35, or Amazon (2gb one for £14.99).
stp
December 2007