Welcome to the forum. Welcome to the FNH family. For LOTS of info and more nice people, come join us over on FN PS90 FN SCAR FN FS2000 FN FiveseveN 5.7x28mm FNP :: FN Forum.NET.
I, too, have an FNX-9; great firearm. It is sometimes picky, at first, about the ammo. The springs are pretty stout, so avoid shooting underpowered loads during the break-in period. Many people just lock the slide back for about a week in order to hasten the break-in.