ddtrr,
Thanks for your reply and sorry I missed it for a couple of weeks... As it happens, I've taken delivery of one of these last week... I've very happy with it. It is able to go all the way to 24@192 and since I have a few experimental tracks with differing levels of resolution, it is able to play everything without the need to resample or fiddle about.
I agree about the gain... It has lots. Personally, I had no trouble installing the drivers... not sure I know/care exactly what else it has installed... seems to have a control panel as well as the underlying driver, but that is not an issue.
I have come across a further review...
http://www.headdesk.me/index.php?title=XDuoo_TA-01_%2B_Mullard_12AU7
and more importantly, the chap has experimented with swapping the valve for a Mullard one. I plan to do a bit of research into different versions of the same model of valve and od something similar over Easter.
Cheers
Sean