I've recently purchased the FN510 Tactical. So far I've only run about 600 rounds through it. I added the Holosun 507c x2 in green as an optic. I love the low profile mounting system as I can co-witness through it with the factory, suppressor ready, night sights. It is smooth, easy to shoot and recoil is very manageable. Love the 22+ round mag. Although I usually carry with the 15+.
Not as many accessories around as I'd like. Holsters, etc. I'm still looking for a good IWB in leather and a decent shoulder holster made specifically to fit the weapon. I do have kydex for an OWB paddle, w/Safariland 578. The FN IWB has great retention but as IWB is not comfortable.
I'm a full sized guy at 6'4" and 230 lbs. This weapon fits my hands really well. So far I am extremely happy that I didn't skimp on quality or performance.
Not being a competition shooter, this purchase was for personal and home defense.