I was in the same boat.I'm looking at replacing my vp9 with the fns9 seeing as how I like the vp9 but I like extra rounds and fn seems to have made a very sturdy pistol with the fns. What do you guys think of the two pistols?
I bought the FNS-9 first, then got a VP9 late last year. FNS-9 rarely comes out of the safe now that I've got the VP9. I prefer the better grip and better trigger on the VP9 over two extra rounds on the FNS. Pick up the FNS-9 if you are into all things FN, but I wouldn't sell / trade a VP9 for an FNS-9.I was in the same boat.
I'd stay with the VP9 since you already have it. IMHO, the fit and finish is superior to the FNS. I like the configurable grip of the VP, the FNS, while the backstrap does interchange, still feels a bit chunky to me.
While a nice pistol, it wasn't worth giving up the VP9 for 2 extra rounds.