Is porting stuff to SFM as much of a pain in the ass as it is to get stuff into Gmod and other source games? Do you still have to go through Crowbar and stuff?
Considering it's still the Source Engine, yes, but you don't need to worry about making physics/collision model data
Source is pretty easy to get models into though thanks to Crowbar and the Blender Source Tools, or Wall Worm for 3DS Max