My experience with Zirh is the same as reported in the previous posts. When I used a Mach 3 I found Zirh shave cream to be a good buy--just like some other modern "designer" shaving creams. It reduced the friction and helped me get a decent shave. Just decent, mind you.

However, imho neither Zirh, King of Shaves or Jack Black deliver a shave that can compare with the more traditional, tried and true shaving soaps and creams.