I have one, from very early in the first run. For me, it runs flawlessly. I've only had one malfunction and it was with one kind of ammo that the gun just didn't function well with. I let a girl shoot it, and it showed the same failure to return to battery that lots of people experienced. Doesn't do it to me, but with her it was almost every shot.
I think they made a lot of good changes after the first run. I'd still swap the firing pin for an aftermarket one.
Ergonomics are amazing. Fits in my hand perfectly, and the stippling is awesome. Not tiring or difficult to shoot at all, especially for a small gun. Very accurate little gun too. I carry mine with the 12rd mag all the time, and it still hides under just a t shirt. Trigger is great.