Last Year, I dedicated my 'music season' to train on Digital Performer while I only had used Reason since Reason 5. The reason for that was to enjoy the instruments in Komplete. But ultimately, I had nearly dropped DP although it's a great soft, because it was too long to load and too unstable. I came back to Reason: Using DP to record the tracks I wanted and bouncing to Audio to get them in Reason (Forget Rewire, too unstable).
So imagine the dance I did when I learned about VST's in Reason lol!
Now I tried it with Komplete and Studio Drummer. Works like a charm!
I wonder how it will work out with Massive though. Gonna check it out very soon!