The recoil spring is STIFF! It's harder to rack than my XDm45, at least it was on day one.
I've been racking it and leaving the slide locked back at night and it seems to be loosening up a bit. I do keep it well oiled.
I received my night sights (TruGlo tritium) from Amazon yesterday ($66) and called a gunsmith to install them. I didn't hear back from him so I did something I probably shouldn't have done, I installed them myself tonight. I got lucky. They turned out perfectly, no scratches on the slide or sights, centered perfectly, look great. Now if they don't come flying off on the first shot.................................
Anyway, I wouldn't say I'd recommend self installation for everyone, but maybe I'll try my XDm next. Then again, maybe not.