I dont think "big" is the issue, as much as capability. For the money difference I wouldent think about the toolroom type machines. The full enclosure and chip auger pays for itself the first day in my opinion. And the castings, ect are bigger heavier.
The "Factory referbished Fadal 3016L" is something I dont know anything about, so not sure where you would be on the price.
I look forward to the day I can get a VF7, its nice to stand in front of a 15' wide machine that you can put 10 688 Kurts on
Gary