I have an older 8 Pre version of this. When it works its great, but there have been bumps in the road as far as Presonus releasing drivers that worked for my setup. I tracked down a certain fw card with a chipset that was reported to work, and that helped a bit. 64bit support was spotty there for a while. Read the Presonus user forums. You'll see some bitching. It is stable now and I will never ever touch the drivers. I say the Presonus customer support is rocky at times.
Not top of the line pres by any means, but it does what I need it to now. I have apogee and grace in my arsenal to compare it to.
That's all I have for you.