I love it man, I've tried all the major daws (cubase, logic, sonar, protools, live, flstudio, reaper, etc) and this thing just blows them all out of the water IMO. It just runs rediculously smooth and is so fast to use. Easily my favorite. I've found myself actually writing a lot of music with it.
But yeah, the set up for spark is sorta confusing to me. If I figure it out I will let you know, if you do please let me know. I just need to spend an afternoon figuring it out.