I'm loving this product so far. The interface is great, in particular their mixer. Sonar could be better if it was to adopt a couple of their ideas. Something simple like the pop-up routing indicators really help visualize what's going on. They even have their own version of the Pro Channel.
I've been struggling with Kontakt 5 and Studio Drummer and I don't think I'll struggle for much longer now that I've tried BFD2. The sounds don't seem to be as polished, but there's way more flexability and tweaking is pretty easy. Seems like the most comprehensive drum software I've looked at so far.
My only question is on the output routing for BFD2. I find it very difficult to route Kontakt drums to individual tracks in Sonar and was hoping that BFD2 would be easier. I can't tell that due to limitations in the BFD2 demo. It can't be used as a plug-in so routing issues are still unknown. If you have experience with part of BFD2 please let me know. Life is too short for Kontakt drums.
Off to put in a feature request for pop-up routing guides in Sonar's console view. Have a good one.