I started out with a Cadex 23 gauge nailer 4 years back that hasn't failed me. Along the way I went from one brand of 18 gauge to another. I started with Senco many years ago then made a quick and long transition to Porter Cable. They were faithful and long lived until Black and Decker bought PC and moved their nail gun manufacture off shore. They became junk. From the I moved to an Oner out of Italy and it was a great gun until one day about 14 months in, it wasn't and you can't get parts for the things here. From there to Bostitch. I actually went through two of these for no other reason than I simply didn't know which way to go. The jammed frequently and fixing that was an allen key effort. Finally I bought a Makita and returned that within days, Makita makes great everything else, not so much nail guns.
So upon returning that, the sales guy suggested a Cadex, who I didn't know made 18 gauge guns. It is flat out the best gun I ever used. Nice tiny entry hole, good seating, accurate depth adjustment and best of all, 16 months later I've never had a jam, not one.