If it werent for my girl calling me talkin about she cant go to sleep you would NEVERget a response from me this early in the morning. I don't know of anyone here who uses it but youngmoe had a digi002 which is basically the same control surface when you really get down to it. Command 8 is usb powered and has midi. Most people say it's really directed at those who have a 002R.
Anyway the control 8 is a control surface. You can mix with it but I wouldn't call it a mixer because it doesnt have inputs, buss section,sends/aux, pre amps etc.
What exactly are you looking for, how much music do you plan on recording, how many inputs do you need and do you REQUIRE pro tools?
Also I wanna mention something about the mbox. Your inputs are limited with the mbox AND the latency caused by the mbox is insane. Not to mention you're running audio from your mbox to your computer via usb 1.