I bought the Hellcat, sold it to a friend after 2 range days. Was just too small for me. Bought the Pro when it came out and love it. I have big hands and a big gut. The Hellcat seemed to disappear in both. (I'm exaggerating of course, lol) but the Pro was just big enough to hold and control and conceal within grasp. IMO
I also have the XDm, which I bought when I accidently bought the wrong holster, meant to get one for my Hellcat Pro, so when I bought the wrong one, rather than return it I went out and bought the gun. lol True story.
Love the XDm also, holds tons of rounds nice and fat in my hand but much harder to conceal. I now use them both as my primary carry. The Hellcat Pro usually in my thunder wear holster for out and around and my XDm with a outside holster when wearing a jacket or my motorcycle vest. Feels easier to get to when on my bike... if the need arrives.
jmo