The quality is very good. I usually tell people when they ask that if your going to capture, edit, and put on VHS, you do not lose quality.
This is of course not a card for professional videographers, but I think you know that.
I can capture at 720x480 (it's the max) using a MJPEG codec. If I'm say capturing to Divx to conserve space, I can only capture at 320x240. However my video computer is quite a slow compared to newer computers (800mhz athlon, 512mb SDRam). My other computer can capture to Divx at full resolution with no problem.
I just stick with MJPEG Lossless though.