Hey Paratrooper! Welcome to the forums!!!
If you do a search on Mad Dog, you'll be up for a week reading all of the posts. There has been a lot written here about them!
I have never seen a Mad Dog in person, and only read about them/talked with Mad Dog owners. You will find a HUGE range of thoughts on Mad Dog knives, both Mr. Mad Dog himself and the knives.
Generally summing things up, lots of people like the designs, and the materials for most of the pieces are a good choice. For some of his larger pieces, I think a lot of people would like to see a tougher steel than O1. 5160 would be great for the bigger pieces.
Pricewise, I think most people are a bit turned off. For $400 for an ATAK, there are a lot of other options out there. But there are plenty of people who have chosen to spend their $400 on an ATAK intstead of other knives out there! Nice to have the variety.
I liek how Kevin differentially heat treats his knives. I'm not sure if RC 62 at the edge is good (maybe should be a bit lower), but at least the blades are diff. heat treated.
Well, that is all I'll say about Mad Dog knives. Pour a coffee and do a search for sure. By the way, the Arizona Hunter was featured in an issue of Tactical Knives. Jeff Randall did an evaluation of that knife. WOW! I think that is one of my favorite MAd Dogs. The shape, the look, it all looked awesome. I think you got one of the best they make. Sounds liek your son turned out to be a great guy too, if he's thanking you like that for your help.