Congrats on your new toy.
As noted there have been a few issues with the FNP-45s but they are minimal.
1) Out of spec ammo with too long OAL will have issues feeding in the magazine. Most notably was the Winchester White Box for alot of FNP shooters. All other ammo I've run have been perfect.
2) Some will complain about the unsupported chamber. A few people on the net have made an issue of this due to a couple that have blown up their gun. Most of that information is hearsay but a couple hold water. Just shoot quality ammo and you'll be fine.
3) Early on, and I'm not sure if was just the Tactical or also the regular version, a few people complained about the pin holding the trigger on working itself out. Again just a very few and very early on.
Personally, I have both the Tac and USG regular versions and love them. I've got over 7,000 rounds combined through them and they've been great, no problems. My one bad day was a range day with some winchester white box and as per all the internet stories it ran like crap. Other than that never an issue with either weapon. Enjoy your new toy, they are great guns.