I've shot a factory rep's a few times. Had one as a T&E for a while too. Fired several qual courses, drills, and made 100 yard shots on a reduced steel IPSC with ease. I got a killer deal on one from a guy on another forum, NIB, but have yet to shoot it. Trigger is very nice for a striker gun. A lot of folks have complained that grip inserts and frame change outs are a PITA. While they arent as simple as some, I maintain it's a non issue. How often are you going to monkey with it once its set up? One thing I'm not crazy about is the mag catch lock on the magazines. I have found on some mag pouches (Fastmags and Safariland slim lines) It digs in/drags a bit. Experiment with pouches if you get one. The G Code pouches work well, as they are open in the front, and I have an old LBT triple belt pouch with kydex inserts that are GTG as well. The inserts on it are open where the front of the mag is. I suspect ESSTAC KIWIs would work as well. The kydex benders will probably take this into consideration in their designs.
I'm pretty friendly with a BDT rep, and he updates me from time to time. He sent me pics of his APX Centurian with a target, pretty impressive. It is G19 sized, and reportedly very nice, but I have yet to see one in the wild. A small PD near me bought them, but I haven't heard of many other adopters. I like the gun a lot, and Berettas in general, but as far as US agency sales go I'm afraid they are at least 15 years too late to the striker fired market.