Surprised I couldn't find anything on this holster. I picked one up and thought I would share some thoughts on it. I've been using and carrying it for 2 weeks, so hardly a long term review but my initial impressions are that this is the holster I've been searching for since I began my concealed carry journey 5 years ago. I'm 6'3" 190ish for reference.
I've tried pretty much all the big name aiwb holsters but claw holsters pull the slide of the gun away from my body too much. The cornerstone solves this problem while still having a grip tuck feature.
I think the feature protruding from the trigger guard has been termed the "wave" although I could be mistaken. I don't know why no one else uses this idea. I had a j frame holster with this feature and loved it. It moves the claw feature closer to the attachments and reduces the footprint of the holster compared to other claw holsters I've tried.
This holster is sooo slim, yet it still tucks the grip. Lastly, the DCC clips are excellent. The spacing between them allows you to put a belt loop between them if necessary. Another detail that I know was planned into this is how clips curve. I think this helps to keep the slide from pulling away from the body. No doubt it is expensive. I think I paid a little over $100 with taxes and shipping. But if it works right then it's money well spent for sure. AIWB carry is very subjective. There's so many good holsters and makers out there and it does seem to take a lot of trial and error. Hopefully I found "the one".