I have a US-800 and it is a buggy mess, IMO, compared with the past interfaces I have used. I have been able to get it to work, most of the time, with some judicious order of operation items specific to using the US-800 and the DAW software.

1. Wait for Windows to fully boot before powering/connecting the US-800 (this is actually in the TASCAM documentation).

2. Go into the mixer applet and adjust latency setting to your preference

3. Run your DAW software as administrator in Win7

I have had pretty good luck using this order of operations.

If I don't do all of them, many times I won't even be able to start recording. This isn't foolproof, as I ran into an issue a couple nights ago where I had been tracking for a couple hours with no issues, then all of a sudden Windows said there was an unidentified USB device - my US-800, and I had to exit out of the DAW, re-power the US-800, reset the latency, etc. etc. etc. and then proceed.

TASCAM customer support stinks, compared with other companies - from my experience so far.

However, one unexpected nicety of this interface is that it actually works as a mixer outside of the DAW software. For my latest little experiment, I set all my mic levels without ever cracking open the DAW software.

-Scott