I was a QLSO Platinum user that wanted to upgrade from to the "Play" version E/W told me that QLSO Platinum "Play" will not work on my QUAD G5 2.5 Ghz, 8 GB with a raid of 6 Raptors!! Apparently "Play" is a CPU exterminator
So I decided to move to VSL and I have bought the Appassionata, it's just great, uses very little CPU, the sound is great, you have at long last real legato (not the horrible QLSO one) (the only reproach, is that the number of articulations available for the Double Bass are very limited compare to the number of articulations available for the Violin, the Viola and the Cello)
Test done so far show that I dont need my Raid 0 anymore
I have bought after the Standard Edition, for 345 Euro, you have a beautiful set, just listen to the demo, I have exactly the same sound at home when I play the demo in Logic ! (no tricks, no fiddling )
With SE, VSL is giving you a demo song, you just need to paste your midi track in it, all is done for you (equa, reverb....)
If I was you I will start with SE, you can always upgrade it !
Download the training video http://vsl.co.at/en/211/442/982/559/707/454.htm
Best
Cyril