This is my first nailer and I'm using it to build a shed. The manual was a little inconsistent regarding placement of a filter, regulator, and oiler, so I had to look that up separately. My compressor (and don't most?) already have a regulator, so not sure why a second one would be needed. It also didn't specify how many drops of oil to use (if not using an oiler).
As with other reviewers, mine will not shoot the last 3 or so nails. But if you slide 1 or 2 more sticks of nails in, it'll finish them off. I have the same problem with both 3-1/2 and 2-1/2" nails. I've been using HItachi nails.
Mine will also not drive in toenails all the way, so those need to be finished off with a hammer manually. Not sure if this is common for other nailers.
Fit and finish are pretty good. No problems out of the box. Only shot through a few hundred nails so far, but everything works fine. I do get occasional jams, but none requiring unhooking and removal of nails. If the gun fails to fire, try pulling back the slide and releasing it again. This seems to tap the nails back in place. It might be that the spring is a little weak, which may also cause the problem of it not shooting in the last 3 nails.
Overall, excellent value for the money. Highly recommended.
BTW, I use this with an 8-gal compressor with 4.5 SCFM @ 90psi. This keeps up with the nailer just fine. I don't do too much sustained rapid firing though, but it seems plenty enough.