A little late here, but I have the FNX-45. Quick review.
The slide is the standout feature. They did a great job on the slide. Looks like it is milled. The parts are pretty high quality as well, hammer is a nice solid part. The serations on the slide are just about perfect front and back. The barrel is very well crafted as well.
Other standout feature is the 2nd-shot. The reset is short and the second shot is just the right weight. You can followup very quickly. You have to cycle the slide if you want to demo this at the store.
If you have big hands, it grips and points very well. Feels cheese-grater at first, but after a minute you realize it is just a really solid grip. It doesn't look it, but once you hold it you get it. The beaver-tail area on the frame makes it nice. You get a very high hold, so the recoil is softer than just about any other 45 you can think of. It's uncanny. Shoots hot loads and normal loads equally well and cycles perfectly.
For the negatives, well, it's kinda like a glock in the way it runs. In other words, I still shoot more accurately with your 1911. Other negative, the sights aren't anything special. And being an FN, it won't have the million sight options that the Glocks and Springfields have. Would look at replacing the stock sights with night sights in any case.
Reliable as heck, and fast and accurate shooter, so recommended. I haven't shot the SARK2 though. So I would think you might add the XDM 45's and the SARK2 to your list of things to try. FNP-45 Tactical and the XDM 45 Competition are probably more sought after, but these days, good luck finding those.
