Yeh, i rewire Reason with Cubase coz i cant use all my effect plugins in Reason. And i dont wanna export separate tracks from Reason, then import them into Cubase to add effects. Bcoz if u have changed something in Reason u gotta repeat export/import operation over and over again to hear.
If u rewire u can insert any effect plugins into a rewire channel that routed from Reason and at the same time work on instrumental or beat and listen to results with effects at once.