Andrew, I had Speedplay Zeros before the Crank Bros Quattros... sinfully expensive and a nightmare for maintenance. Philips srew-heads (is anything worse?) that have to go snug plus a ΒΌ turn and then it's up to locktite to save the day. The float is wonderful, even if you feel you you are walking on ice, but they just weren't durable and if they got really wet they wouldn't release.
They'd hot spot on long rides, were terrible to walk in, and you could pull out of them in a sprint.
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