I love mine. I have the 8gb version of
this model. After two and a half years of heavy everyday use, it's still going strong, though it has lost some battery life. Originally, it did have close to the advertised 24 hours on a single charge; now it may be about 15 hours or so, which is still great.
It doesn't support DRM-ed files, so no Audible. I use it exclusively for audiobooks. I haven't added a micro SD card, so I don't know if there are any issues with it reading from a card. The clip on the back is still working fine--a major selling point for me. I would definitely buy one again.