Umm it works like an interface. I have one and like it a lot. The pres are nice, I don't use them a ton because I have better, but they are above average for an interface like this. Latency is not an issue when tracking. Those are my two biggest things with interfaces.
The one weird thing is the MixControl. It's supposed to help with routing etc. But I use Reaper where routing is a breeze, and setting up headphone mixes is no problem. So MixControl has just gotten in my way a few times. I spent forever trying to figure out how to route a track out through an output to a compressor, and then back in through an input. Now that I have it figured out it's not hard, but it seems unnecessary to me. You can run without MixControl on, but some things don't work. I usually don't use it at all.
But, I would recommend it highly. And to Ryguy76, the manual sucks, but a more focused question would have been more helpful too.