I have been using 2 Studio-Captures for over a year now and I really don't remember how I got along without them! It has the 12 preamps but there are 4 more tip-ring-sleeve jacks to connect whatever you like. I have been running Sonar X3 with 32 ins and 20 outs with these things and it has been great!
There is one fault I have found. The USB does not control the power to the Studio-Captures. If you switch the computer off before the SCs the interfaces will NOT turn off. I always boot up the computer first THEN turn on the interfaces. When I power down I turn off the interfaces FIRST, then the computer. There is an auto-shutoff feature on the SCs set for 4 hours but turning it off does not help. I have been told that the Octo-Captures are the same way.
Other than this, the SCs have performed brilliantly. As a matter of fact, they have replaced my trusty old MOTU 24io system.