Well, UK stocks finally came through for me and I have my build up and running in a test rig without real issues (I'm using i5 2500k and have full graphics acceleration after a few tweaks). Also got HDMI audio up and running as well as full powermanagement via speedstep patching and DSDT/SSDT.
I will post my build on here when it is all cased up, but wanted to mention that in the uK the version I was sent comes with a non-atheros based wifi/BT card. The one it ships with now is Azurewave AW-NB087H which has Ralink chips in it. I did not manage to patch this one and so I instead bought this replacement: http://www.ebay.com/itm/28083630116...X:IT&_trksid=p3984.m1439.l2649#ht_3781wt_1136 works well without any kext editing.
All in all I'd agree that this board is a fantastic Lion OS X board and should be 100% ML compatible too.
Warning: The stock Intel i7-3770k cooler didn't fit.
If you don't use a SSD it will fit, but with the SDD mounted to the bracket it does NOT fit.
M350 case manual says any stock Intel cooler will fit, but they fail to mention you won't be able to have the SDD installed with some motherboards. This Zotec board doesn't have the cpu socket all the way to the side, they put the pci-e slot inbetween the cpu socket and the edge of the board.
Also the USB header cable doesn't reach.