masterfit is the biggest bullshit in bootfitting, even bigger then surefoot. It does not mean shit. The best bootfitters I know have nothing to do with masterfit.
Thats not to say that all 'masterfit' certified fiters are bad, it just means that they are not necessarily good. Same goes for surefoot. I have seen some shitty stuff come out of surefoot (cough*whstler*cough)