I just installed the us20x20 a month ago and I really love it. I had a presonus 1818 and the Tascam, I find to be much better. No pops when you turn the unit on or off. Very good latency. Nice sound. However, I have to reselect the audio device in my DAW or the latency drifts up over 20 minutes or so. Any ideas about why the latency creeps up on me???