The FNP-9 was my first handgun purchase. I now have shot over 600 rounds and have not experienced any of the problems discussed on the FN website. Mine does have the "notch", but no visible cracks.
Most FNP problems seem to be "one off" issues and remidied quickly by the friendly factory service.
I have enjoyed my FNP, it is as accurate as I am at the range, Ammo can be found locally in the $8-$9 per box range so it doesn't cost a fine meal to practice at the range.
Before buying on line, talk to the FFL dealer, he may be able to order one below the price you would pay. Shipping and transfer fees would be almost 10 percent of the cost, local taxes may be less than that.