What problems are you having? Personally, I'm using a Behringer UCG102, which I had heard worked well with the Pi. It was not doing duplex audio, however, until I changed the samplerate from 44100 down to 32000 (honestly, I don't really miss hearing that last couple thousand hertz).
It seems like whatever device you have, you need to fiddle around with it a lot before it works at all. Good luck, -Brian Fay
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