I have just installed one of these on my main PC, running Kubuntu 9.04 AMD64 and Vista.
Installation into the case went fine, no problems. Documentation is reasonably clear, certainly for someone who has done this before.
Vista installation was OK, required drivers are supplied on CD.
As usual, nothing provided for Linux but standard system worked with only two problems. On-board Ethernet worked without any problem.
On-board video didn't work at first but soon sorted out by removing /etc/X11/xorg.conf (This quite often sorts out video problems, especially after a hardware change. Make a copy first though!)
On-board sound does work but I have to have volume turned up to maximum and even then its not very loud. Will do some more experimentation when I have some time.