Here's a review I did after my first range trip with it. Adding to what's below I feel it is on par with my 9mm osprey as far as sound at the shooters ear, but it still has that weird "ping" to it.
My opinion,
The trigger is not that bad, it is a flat face and does build prior to the break but so do all striker fired triggers. Take up is not terrible and the reset is fairly short. The thing that got me was the first few times I pinched the hell out of my left thumb, I am used to holding with my support thumb resting next to the slide. The sights are off from the factory, it was printing left and after a look sure enough the rear sight was not centered. I shot it sxs with my FNX 45 Tactical with an Osprey and with 45 Octane, the Maxim 9 running 147's is substantially louder. I didn't have good subs with me, I will try and do a video in the next couple weeks with subs. It was "hearing safe" to me even in the short configuration with 115's. The weapon does make a "ping" noise when it shoots, this noise can be replicated by tapping a empty mag on the front of the gun, I wonder if more baffles would help with this or even carbon build up might silence it a little. I can see myself really falling in love with this gun. I think that it has a lot of advantages and only a few shortcomings.
Advantages: standoff-this weapon will fire even if the muzzle is pushed into something, hearing safe (to me) in all configurations, comes factory with decent sights, is holster able, and in its short config is about the size as a G17 W/ threaded barrel.
Disadvantages: Mounting a WML would be comical and not practical in any way, I would prefer a slightly larger frame, Looks bulky and goofy, is slightly front heavy, and I will need to shoot it more to get used to the grip (it takes me a second to get on target).
(disclosure I shoot a stock glock trigger very well, even better than I shoot my ZEV's)