I bought one. It's a great little handgun. The DAO is very easy to learn. The fact that it comes with night sights already installed is a plus. I've had zero malfunctions with a variety of FMJ and JHP ammunition.
Of the Beretta Nano, the Kahr PM9, and the Sig P290RS, the P290RS is the smallest of the three by a smidgen, but also the heaviest.
I carry my P290RS, and my Nano, with Winchester Ranger 115 +P+ JHPs.
I don't pocket carry it, or the Nano. Neither of them come out of my pockets as slick as my LCR or LCP.
When I carry it, which is often, I use a small Tommy's gunpack, or the neat little paddle holster it came with.
I've never carried it with the laser it came with.
There are some good YouTube videos on the P290RS.