This thing is on par with the big name VST synth emulations (Pro-52, PPG, Model-E, etc).
*The sound quality is first rate *the GUI is impressively complicated - which shows just how much effort refx put into creating it *the documentation explains a lot that might not be obvious at first *CPU usage is minimal *Realtime MIDI control in Cubase is the best I've seen in a VSTi
I've been a SIDstation owner for quite some time, and this VSTi blows it's hardware equivalent away! The SID sound might now be everyone's cup of tea, but if it's your's, you can't go wrong with the QuadraSID.