They're good pistols and excel in capacity among 45's. I find that I don't hear more about them because the PPQ, M&P, HK's, XD's, Glocks and others have been around or been mainstream for awhile now. The market is flooded these days with 45's and even though the FNX is wonderful it's main feature that overshadows the rest is it's capacity. A lot of other pistols will just feel better for the majority of people. Well at least for the civilian market that's why I feel it goes unnoticed. It's ergos are ok but not great. And the grip is fairly rough for softer hands (most people sadly)
Anywho I think it's gaining more popularity now. I see a lot of interest in them as of late on forums. I think now the guns had enough time to get exposed to the masses either through forums, friends, gun shops, ect and it really is an appealing firearm. I like them because they're DA/SA very high cap 45's. Hard to find many to equal them in that regard.