I spent some time playing with a 320 a while back when I was considering it for a new duty pistol. Maybe ran 150 rds through one. It was a nice pistol. I ultimately chose to stick with a Glock 17, although not because I believe it to be any better. Just extremely familiar with the 17 and have been carrying it on duty for a while now and am comfortable with it.
If I were to switch it would be to the 320 though.
-Jake