the Babyface is working quite good with 192kHz sample rate and 2x128 frames/period in jack.
But you have to take care of USB:
Because of my *!#* GA-Z68MX-UD2H motherboard, I can only run 2in / 2out channels atm (but with lower latency than i.e. 48kHz, and not more xruns).
I can only use it on my USB 2.0 ports in Linux, with the EJ168 USB3.0 Ports, I can run it in win7 Virtualbox and Totalmix (in Normal Mode of course), which is funny, because most devices on USB 3.0 Ports don't work at all in Virtualbox atm.
As long as my DVB-S2 usb device is not connected, I can do 10in/12out in 192kHz.
This appears to be a bug/feature of the Intel automatic rate switching hub.
Although I have not done much testing with that (only Amplitube3 and reaper) it should be OK.
Maybe I can use the Motherboard USB-Connectors to work around the Problem in the long run.
Hope that helps someone.