Joe Czerwinski wrote a review of Mad Rock Shark Climbing Shoe on February 7, 2013
Familiarity: I've used it several times
Upon opening the box, I was visually pleased with how the shoe looked. They were difficult to put on the first 4-5 times, but after the initial break in process, they are the bomb. Once you figure out the subtleties of putting the shoe on, its a piece of cake.
I have been a devoted Demon user, but I feel this shoe does everything the demon does, and it does some things better. The ridge on the heel makes hooking smaller edges very secure, and I have not noticed a decrease in performance with hooking larger - smooth slopers.
I have used them on techy vertical routes, and on steep terrain where toe and heel hooks, bicycles are mandatory. I have comfort and stability on the smallest of edges.
I was really psyched to have more rubber on top of the shoe under my big toe. There is a problem at Hueco that involves a painful left toe hook, and I would love to go back and try that problem with the SHARKS.
The only test I have not done is on real rock. All of my testing was indoors.