Shot the P320 X-Full with Romeo over the weekend and I am VERY impressed. Out of the box, the Romeo was spot on, at least for the 5 mags or so I shot at 10-15 yards. There were a couple of YT goobers who were trashing the same gun with Romeo combo, but I didn't experience any issues with the dot or "lack of inherent accuracy".
Based on dry fire, my thoughts on the X series stock trigger was that it was interesting. After shooting about 50 rounds, nothing negative to note. Reset and break seemed fine. Just different than I'm used to. I was trying to index the trigger on the little nub at the bottom of the flat faced trigger and that seemed to work well. Grouping using CMO's fruit metric was less than a plum for slow fire and around Fuji apply in "quicker" draw and follow-up shots.
Similar to the 43x, plan is to shoot this gun a lot over the next many months, including getting back into USPSA matches, but in Carry Optics. Need to pick up more mags, but have the rest of the gear ready.
One aspect that I want to look into more for the P320 (as well as the 43x) is to stipple the underside of the trigger guard. My Gucci Glocks have undercut and stippling that helps with how I grip pistols. Other than that, really liking the P320 so far. Want to shoot the X-Full size by side with say a Glock 17 or 34. Don't envision switching away from Glock any time soon, but can certainly envision more P320 variants in my collection before too long. .