Having both, once Holosun comes out with the 507K I will be replacing my XL/Romeo 0 with a HeckKitten/507k combo. I just shoot the HeckKitten better, like the CQB guide rod, and I really like the ability to have fixed usable irons if my optic ever fails. While I wait for decent glass to be available, maybe I should get it Cerekoted in an appropriate HeckKitten paintjob. Maybe a nice purple with a devilish Hello Kitty theme.The P365XL is what one guy at work is planning to get. Told him to check out Hellcat as very similar in demensions.