I have Porter-Cable roofing and angle finish nailers. Both work very well, but haven't had just a lot of use; I'm not a pro. They're very light-may be made of magnesium rather than aluminum. The finish nailer shoots 15ga 2 1/2" nails that have a nearly full head, so they look like hand nails (at least the P-C brand nails do; haven't tried other brands) I also have a Bostitch framing nailer. It sat unused for 20 years before I got it, and ALL the plastic/rubber innards disintegrated. All are still available, though, and it now works great. The rebuild kit only cost a little bit more than a whole new Harbor Fright nailer. I also have a HF brad nailer. Very light duty, kinda clunky to work with, but does shoot brads.
I'm semi-guessing that the usual HF caveats apply to their air tools. If you only use them occasionally, they will probably work fine. If you're using them all day every day, stick with Porter-Cable, Senco, Bostitch.
I seriously considered Paslode, but when I realized how many nailers I'd need, and since I already had a compressor, went with air. Then too, it seems like every time I'm in a situation where I really don't want to be dragging an air hose around, a cordless drill and screws work just fine.
