Ive got a Roland Duo Capture EX .... Its actually a good little unit, and i run it on an i5/Win7 rig, at around 96 smpls (about 10ms roundtrip), without any dramas at all.
Be aware it only does 44.1k/48k.
I find the headphone output a little lacking in volume as well.
Those are my only real complaints.
Very stable on my system