I'm interested in the X5 a lot! Have been since it was announced and I saw the prototype. Had the chance to get one recently but looked into the extra costs I didn't. I shoot a Glock 34 in competition, I also own a 17 and a couple other glocks. So holsters, mags, mag pouches are all the same. Really the cost of the gun isn't important, what I couldn't justify was the extra $4-500 bucks on new mags, holster and belt/mag pouch setup to run this gun the way I want in IDPA/USPSA.
If you already have a P320 and mags, then the jump to the X5 makes more sense. ONce they come out with the X-Five Vtac and the updated mags available for it I can see it being more viable.