i'm currently riding eggbeaters and quattros and they're both fine. i think unclipping happens when the cleats wear down (which is pretty quickly). i've got a set of premium cleats and they seem to be made of a tougher brass, so they're still fine. i've also found that my left cleat wears out quicker than my right, so after i go through two sets of cleats, i put two right footed ones on my shoes. essentially it's a dirty buy-two-get-one-free scheme.
i'm currently riding eggbeaters and quattros and they're both fine. i think unclipping happens when the cleats wear down (which is pretty quickly). i've got a set of premium cleats and they seem to be made of a tougher brass, so they're still fine. i've also found that my left cleat wears out quicker than my right, so after i go through two sets of cleats, i put two right footed ones on my shoes. essentially it's a dirty buy-two-get-one-free scheme.