I recently bought an Enigma Express for my P365X after spending considerable time on Phlster's website and on YouTube watching their videos and videos by others about the Enigma.
I've been tweaking it, moving if around my body and adjusting the straps and the wedge for about two weeks, off and on, getting it dialed in. Phlster has put a lot of thought into concealed carry, and the Enigma system.
My opinion is that if you are willing to take the time to fiddle with it to accommodate it to your particular body it will likely work for anyone. But, going in, I think important to realize fitting it properly takes time and effort. It is not just a strap on and go solution. I suspect many people give up quickly and decide they don't like it because they haven't the patience to get it dialed in properly.
I think a 6" N-frame is a bad idea for concealed carry with the Enigma. Maybe for a truly huge person, but not for most of us, for sure. Phlster does have an explanation and a video, IIRC, on how to measure yourself for what size gun is likely to work for you.
I like it for carrying when OWB, my preferred method of carry, is not an option, or for when wearing clothing that will not accommodate a proper belt.