I have Sonar 2 and I've tried using FL as a VST. It works fine, at 44.1Khz anyway. But I have to ask - why bother? I'm moving to FL as my primary tool because I found both Cubase and Sonar to be frustrating to use. Does anyone here really think they'll use FL as a VST, and if so, why? What's it going to give you that you can't do natively with FL?