I might be wrong about this but in general I have found that cases (not only gun but others as well) that have one or two combo locks are inferior to those that have a single keyed lock.

I don't know why, but Mexican and Hong Kong cases tha tfall apart quickly all seem to have the double-combo locks.

Sort of like real crappy double-sash windows have two closers - not one. I think it compensates for crummy construction and fit.