I had two Hellcats and traded one in last year on a 365X and plan to do the same with the other one soon. Both the Hellcats shot well and were reliable, no malfunctions that I can remember. My issues with them are mostly nit picks and personal preference. The first, and most annoying to me is the placement of the slide released lever, it’s too far back for my grip and the slide would almost never lock back when empty unless I consciously focused on loosening my right thumb a bit. I don’t have this issue with the 365X. Second, I don’t like the U Notch rear sight. It works, just not my preference. I’m faster and more accurate with the standard 365X sights.
My previous carry was a Ruger LC9S Pro and both these guns are leaps and bounds better, so it’s really down to personal preferences. My main full size 9s are P320 Carry’s, so I appreciate the similarities across the Sigs. Planning to get a 365 Macro at some point too.