I have this gun and I love it dearly. You do not need a compressor and line and all that stuff. You just insert your pre charge batter and it last for 1400 nails, the fuel cell last for 4000 nails and you are cordless.
I can drive 3 inch ring shank nails with zinc coatings all day. It has a depth gauge, a non maring adapter that won't dent the surface like on a deck, and it has the adapter that allows you to toe nail.
It comes in a case with one battery and a charger. The fuel cells are $12 for two canisters. A box of nails runs from $29 to $65 for about 5000
The gun sells for $399.
The benefit is again, no compressor or lines and you don't have to worry about someone stealing your compressor out front when your in the back nailing.