I have just begun using Sonar Professional after using Reason exclusively for years.
It's a great program. I'd even say it can be quite a teacher when it comes to synthesis, signal paths, and creative mixing techniques. The version i have doesn't have any vst capability(6.5.2), but i love it, so i kept it.
Prior to this setup, i was running Reason in tandem with Komplete 8, Maschine, and u-he's gorgeous VST's within Logic (before the upgrade/downgrade debacle took place).
Anyway, the need for more diverse eq's and signal proccesors overall is what leads me here.
but my inital question to the salesperson was, "Does it have reWire?"
Resounding yes=sonar professional!
diving into rewire TODAY.