Its been said already (seveal times in fact) but good choice. My 9mm is also an M9A1.
If memory serves M9A1s are leftovers from a Marine Corp contract (someone correct me on this if I'm worng, this is what I was told) which could explain why the ones I've seen seem to be slightly cheaper than a commercial (Italian made) 92FS. It is slightly different from other Beretta 9mms. It differs from the 92FS in that it has a beveled mag well and has a rail from the factory. They also come with those fancy coated magazines.
Mine has several thousand rounds through it and has not malfunctioned in any way, shape, or form. Congrats on a solid firearm.