Jeff actually designed the first Falcon that was built at FWC. While I never used one myself, the biggest con to me was that it wasn't much bigger than a dog house. The same goes for our Puma model. Tight fit for two people.
The pros to it is that it does give you some place to sleep and the basics to go camping. As far as I know, FWC and ourselves are the only companies that actually make a pop up for those size trucks also. Someone else may be making one by now. I haven't really done the research to find out if anyone else has started to make one for that size truck.
If you get a chance call FWC or ourselves and I will be happy to go over what you can get in one and how it would work for what you want to do or how it won't.