Well, since it imports Poser/DAZ content and has the full Carrara 6 renderer, I'd say go for it. You'll get much better interior renders from Carrara than Firefly, since Firefly doesn't yet officially support GI (global illumination/radiosity). There will still be a learning curve, and you'll almost definitely still want to set up your poses in Poser, but the rendering engine will seem like a gift from above. Think of it as a $20 rendering plugin for Poser :)