I bought one of those bad boys about a month ago. I bought the unproven piece because 1) it was Swiss made, 2) I loved the trigger, 3) It seemed well made.
Well, handling a gun and shooting it are two different stories. The sights were poorly regulated (left and down). I called MRI and they weren't very helpful and also told me that they didn't have taller rear sights. The recoil spring could stand to be a little bit stiffer. It takes little force at all to move the slide back a couple of millimeters. In fact, you can shake the gun and hear the gun rattling to the front and back (not side to side-the slide to frame fit is very good). Out of 300 rounds, I had 3 occasions where the slide mysteriously locked back in the middle of shooting and I don't think my thumb nudged the slide release.
Overall, it should be a nice pistol when they work the bugs out, but if I could go back in time, I wouldn't have been a guinea pig and bought the gun.