Update. Still no decision, but there is currently a P320, compact medium, in my possession. Chief sent it home with me today. So, here is a brief summary of my initial impressions.
The bore axis isn't as high as pictures make it seem. The pistol is small, feels small. The wife says it feels like a toy. The medium grip is small, but comfortable, if not a little slick. Overall fit and finish is excellent.
Take down is easy. Taking the fcg out is simple and fast. I like the idea, and it seems to be executed very well. Without the fcg in the frame, it takes on a whole new feel of toyishness. The frame is quality, but just has a different feel. I think it has to do with slickness of it.
I ran a magazine of 115g fmj through it as well, from 7 and 15yds. The trigger is different. Light take-up, then a heavy, but short, wall. It breaks fast, but not as light as a Glock or M&P. Reset is short and quick, with an audible click. It is soft shooting and accurate, but I found I was shooting low. Before I say it's the gun, I think the heavy pull might have had me pulling instead of squeezing and dropping the shots.
As it sits, it's a fine firearm. I'm going to be shooting it more this weekend and I'm carrying it while off duty. And that it shines at. It carries very easily, is very light and it size is easily concealed. And that's in the plastic paddle that it comes with. With a better holster, I think it'll disappear while being carried.
I'll update more after this weekend when I run some more through it. I'll shoot her g17v4 alongside for comparison, maybe my FNP9 as well. I like it right now, but I'm up in the air as far as the trigger and slickness is concerned. A bit more range time might clarify that.