I custom ordered one of Mark's knives a couple years ago, and he was perfectly honorable in our business dealings.
I really like his blades, and I bought a second one used. They take a great edge, and they are very strong. Two years ago, his grinds were good, but not the most symetrical I've seen, but good for the price. He has probably improved over that time span, but I would rate them excellent for function, reasonable for fit and finish. I would not hesitate to buy another knife from him.
Harv