Dradam:
First of all, welcome to the Forum and to the exclusive club of owners of the world's finest pocket pistol.
As for longevity, I took delivery of an early-issue Farmingdale R9 (32nd of the first run of 47) in May 2004, and have carried it on a daily basis ever since. I ran sixty-seven or so rounds through it at its first outing. After that, however, I have run no more than a magazine or two per range session just to retain familiarity. I haven't kept a round count, but the pistol is cleaned every time it is shot (and occasionally in between sessions), and I replace recoil springs when I think I may have run about 200 rounds through it. I stocked up with eight or nine of the original springs when I first acquired the pistol, some from the factory, some from two other Forum members, and at last count still had four of those springs left.
Just for your evaluation of a Rohrbaugh's longevity and durability, here is a photo taken of No. 132 back in May after five years of daily carry. It came with blue CF grips, and I have since acquired extra grips in black CF, G10 and OD and silver aluminum. I usually carry it with the OD Green aluminums shown here. And, by the way, it's in my pocket as I type this post: 8)
(http://i2.photobucket.com/albums/y30/RichardS/rohrbaughr9no132fouryearsofuse-1.jpg)