I have a very slight (not even sure its there) rattle when the fan is on medium to high levels, and it bugs me a little that mp3s from the SD card don't flow together seamlessly (there's a slight pause while the next song is loaded) but generally it's excellent.
It'd also be nice if you could choose whether it resumes music when you turn it on - so far it seems to start playing even if you had it muted when you stopped. Maybe I've just missed a setting though..