
I once had a pair of Gel fusions returned as I was getting problems wih my left forefoot. They were returned on the basis that I'd never got that problem wearing other shoes before.
I'll state now that it was not a con, my pro advised me to do it and arranged it all as I genuinely was getting a foot problem.
I can't see what kind of test they could have done as the shoes looked perfect in every way, no faults could be found visually or just by feeling them.
Anyway, outcome was that Footjoy just issued a credit to the dealer which let me chose a new pair.