I just picked up an FNP-45 at my local dealer on Monday. It's the two-tone variety with stainless slide. Link to this model on the FNH website is below. The grip fits surprisingly well in my medium-sized hands for a 14+1-rounder. I like the ergos and the grip angle better than my Glock 21SF. The ambidextrous "safety" is really just a decocker, which doesn't bother me a bit as I'm a big SIG fan and don't believe in the need for an external safety so long as the first shot has a traditional DA trigger pull. The machining inside the slide is primo. The inside of the frame looks very much like a Glock.
The DA pull is very smooth and compares favorably with my SIG P226 Navy, although the FN pull stacks more than the SIG in the second half of the pull. The SA pull is very crisp and is similar also to the SIG, but the take-up is noticeably heavier, as if FN took a SIG trigger mechanism and put a heavier trigger return spring on it. The trigger reset is about the same as a standard P226 but of course is longer than the SRT on a SIG Elite. Field stripping is identical to a SIG. The magazines (3 included standard) are steel with a straight weld up the back of the mag. The box it all comes in is HUGE; much bigger than a SIG blue box. You could hollow it out and use it for carry-on. With the "FN" logo boldly embossed on the box, wouldn't that drive the TSA crazy?
I put the FNP-45 next to my Glock 21SF to make some comparative measurements. The FNP-45 comes with two backstraps, one flat, one arched. I use the flat one as it fits my hand better. I kept my calipers parallel to the bore and measured both guns midway up the grip from front to back. Since the Glock has finger grooves on the frontstrap, I measured it at the shortest distance (between the bumps). The Glock 21SF measures 2.35". The FNP-45 measures 2.12". The width (thickness) on both is the same: 1.30".
The distance to the trigger on the Glock is constant, whereas the FNP-45 is DA/SA and therefore has two distances. Again holding the calipers parallel to the bore, measuring from the center of the trigger face to the indentation on the backstrap, the Glock 21SF is 2.87". The FNP-45 is 3.00" (DA) and 2.63" (SA). Both triggers fit my medium-size hand just fine. The DA trigger on the FNP-45 is exactly on the pad of my trigger finger with the edge of the trigger exactly in the crease at the first finger joint.
I can't comment on controllability as I haven't yet fired the FNP-45. The 21SF has the finger grooves, which fit my hand and help controllability. The FNP-45 has no finger grooves, but the polymer has a large checkering pattern molded on all four sides of grip that literally holds onto your hand.
I'm anxious to get it to the range. So far, I'm extremely impressed. I would sum it up by saying it's like FN took a Glock receiver, fixed the goofy grip angle and added interchangeable backstraps, exchanged the Glock's "safe-action" trigger for a DA/SA setup with ambidextrous decocker and slide release, then put a SIG slide on top. The barrel looks like a barrel; the proof will be in the shooting.
http://www.fnhusa.com/le/products/firearms/model.asp?fid=FNF020&gid=FNG001&mid=FNM0062