What's not to love about the PreSonus Quantum? Lightning fast Round-Trip Latency, solid drivers, phenomenal preamp & converter quality, and the ability to cascade up to 4 Quantum's together. I currently have 3 Full size Quantum's and 1 Quantum 2 (the mobile version) for my mobile rig. As much as I love the Low Latency direct hardware monitoring capabilities of the Studio 192 systems, there's something to be said for only having to manage one application, and monitoring through native plug-ins while tracking.
In the above playlist, you'll find what I consider to be "everything you need to know" when running the PreSonus Quantum Thunderbolt interface, all packed into a single playlist for your convenience. :)
Hope these videos are helpful! Cheers, M..