I did first own a regular P365, but had a good opportunity to move it and bought a P365X for the straight trigger and optics cut. Admittedly, I'm still on the fence about an optic. I like them, but I generally pocket carry (thus why I like the smaller grip) and don't know if the optic may be too much in my pocket. I have an astigmatism so, unfortunately, Sig optics don't work for me. I've found that the Holosun optics work better for me, but haven't bought the 507K yet. I have the 507C ACCS on my P320 and like the chevron reticle and ring (check it out if you haven't seen it yet). I'm hoping that they may put that reticle in the 507K in the near future (and I may have some money) to get it. In the future, I may have both an optics version and non-optics version of the P365X depending on how I'm carrying. I definitely love and I'm committed to the platform, having acquired a bunch of mags. Hope this may be helpful! Blessings!
As an aside on that - check out the Holosun EPS Carry - its essentially the enclosed emitter iteration of the 507K and fits the same optic footprint, so it will direct mount to the Sig 365 optic cut. I'm running a 507K on my X-Macro, plan to replace it with the EPS Carry sight when funds allow. It gets old having to clean out the crap accumulated in the shooter-side of the open emitter sight every day. Lint, dog hair, and other schmootz.