I use an iMac late 2013 with 32 GB of ram, intel 3.5 GHZ i7, the lib is on a SSD, and I must say I have no prob at all with drop out, spike, or else, I was a bit afraid by this, but it's cpu friendly for me. The sound is... HUGE, wide, clear and airy, I think we'll have to learn how to musically use this lib, "no more full hands of notes", for me it will be the release point of my tracks, a kind of cherry on the cake. I feel ok with the interface, my only small prob is I would prefer to have all the mics together(maybe in a floating window), for the mics, I prefer the non "advanced" and use the close and far slider, very useful and easy. After one hour of pleasure, I've got the feeling, I'll have to learn a lot to use this "baby" as it deserves, this is probably where our friends at Spitfire will have to help us...