I have had a FNP - 45 for a while now. I really love this sidearm. Fully ambidexterous, recoil of a .40 cal, great sights, very accurate, and highly reliable. Surprisingly, it conceals well for it' s size.
However, be advised, this thing is a beast - a real heavyweight. I have fairly small hands and had a learning curve to find " my" way of handling and shooting it proficiently. If you can rent or borrow one before hand you will see what I am talking about here. I have zero experience with the 9mm so I can't really speak on how well it performs. I think that if you were to talk with other FN owners you will pretty much find a happy bunch.