I purchased a FNP 45 Tactical, same gun but has the trijicon Night Sites, longer 5.3" barrel, and have been extremely impressed. It does not recoil as much as other full size 45's I have shot in the past, and was much more accurate than I thought. I shot everything from 230 grain ball to JHP, to hot CorBon 200 grain hollowpoints.
I ordered a Trijicon RMR 9 moa dual illumination amber dot for the top. I am a FN fan, but am glad I purchased it over the HK 45, and yes I am an HK fan too.