I have a Beretta Nano ordered, should be here by the end of next week.
I was looking for a flat single stack 9mm for low profile AIWB.
The Walther PPS is nice but a little larger than what I'm looking for (I already have a Kahr CW9) and I still don't like the fact that removing the backstrap disables the gun.
I have a Kahr PM9 that I use for pocket carry, but their little slide stop spring arrangement is fragile. While my PM9 hasn't had a problem with it yet, one of my other Kahrs was turned into a jammomatic when the spring was ever so slightly bent on re-assembly. When you factor in that the screw that secures the spring is threaded directly into the polymer frame, it's not a confidence inspiring setup.
My research shows the Nano has it's share of issues as well, but they seem to be primarily function issues with the Wal-Mart Federal Champion ammo (which I stopped using after having my own problems with it in "real" guns).
I played around with a Nano and like the build quality, the size is right and the trigger feels very Kahr/LEM like.
Not having a slide stop lever will take some getting used to, but isn't a deal killer for my intended purpose. It's one of the trade offs for having such a slick sided, flat gun.
One thing that sealed the deal was discovering the Nano has a built in "gadget" of sorts.
The striker block begins to protrude from the top of the slide just in front of the rear sight as the trigger is pulled.
Covering that with my thumb on re-holstering should give me a tactile indicator of any trigger movement, which is a good thing.
Here's a video I found that shows this.
http://www.youtube.com/watch?v=28qXSbyra5w
I have 500 rounds of 124gr. Winchester NATO FMJ and 100 rounds of Federal 124gr. HST standing by for function testing.
Hopefully I'll have a positive report on this thing next week.