I bought this adapter when I got fed up with the problems of the one that came with my barebone.
It works fine with ALSA (snd_usb_audio) even OSS emulation works ok. Sound is nice, as far as I can tell from the headphones I use.
It's a very austere looking piece of plastic. Don't let that fool you it's actually quite cleverly thought out.
Imic2s product page
The one thing that doesn't work is concurrent access. When one app is using the card noone else can chime in.
I don't really mind but some people do.
