Not quite sure the original poster was asking if it was an improvement over Masters chalk.
Maybe he wasn't but Master sells for 22 CENTS a cube and Kamui sells for 27 DOLLARS a cube. That's quite a difference. You'd think that for +$27 you'd get something worth paying $27 more for. IMO, that isn't the case. As I said I'm a big Kamui fan but the chalk is a mystery to me.
Anyway, peace, brother. I'm not a hater. I just didn't like the chalk.