You probably have one of the old American made Sencos, when they were one of the better guns. Not so any more. Like almost all the rest, the 15 ga. Senco I just traded off was made in Taiwan, and while it is a serviceable gun, it is just another gun.
The trimmers I know have all taken back their DeWalts and traded them for Bostitch. To a man, they hated the DeWalts. The specs were great, but the guns weren't. Most common complaints were that it jammed, and that things just "broke" on them. Triggers, drivers, magazine springs, etc. We have only one authorized service center here, and parts/service wound up with the guns being in the shop as long as 3 weeks for warranty. That's three or four houses they could have trimmed out with the gun instead of having it in the shop.
I had excellent luck with all my Bostiich guns, and they seem to last really well on the job, even in the hands of my guys. If you are looking for a 16 ga nailer, the Bostitch gun is pretty good; it will drive a 2" nail through a solid yellow pine knot. If you are looking for a 15 ga angle nailer, the Bostitch 15 ga is even better than the 16 ga.
Bostitch has some pretty good combo deals on at Amazon, and I think they have free shipping for most of them. I just got the 15 ga/18 ga gun combo with the compressor, lines, etc. for a lot less than I thought it would be. I like the compressor a lot as it has a quick recovery, pushes a decent amount of air and has a six gallon tank. It is handy to have two brad guns if you haven't before.
When I am hanging doors, I load one of them with 1 1/4 brads for the trim to jamb detail, and then the other with 2 1/2 brads to tack trim/jamb into place before nailing with the 16 gauge.
Great combo for baseboard/shoemold, too. Just use the same brad sizes and you are are ready for both.
Robert