Tried this on a Gigabyte Z68-UDH3, with an additional PCIe card as well.
Most things seem to work (Yay!), with the exception of sleep (Booo...).
Update: Self powered devices (WD USB3 disks, specifically) work fine, but I'm having a problem with the only bus-powered disk that I have:
4/26/13 10:10:20.000 PM kernel: USBF: 34330.941 The IOUSBFamily did not receive enough extra current for the SuperSpeed device (My Book 1130) at 0x1ca00000, asked for 400mA but got 0 mA
Any hints or things to try?