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Unclip side has gone through three cleats compared to no breaks on the other side. Properly installed. Properly maintained.
That is normal with other cleat systems too... even my favorite (but no longer made or supported) Time Equipe pedals with its brass cleat-- the front alu or plastic bit is just for guiding the block of brass.
The problem with the Speedplay Zero-- other than the feeling that the "cleats" are horribly overpriced--- is that the cleat component is really the pedal and the "Speedplay cleat" is really the retention mechanism and directly exposed. Speedplay Zero cleats seem to last longer--- and work better-- when combined with the optional steel "sole protector". The clip seems to really also demand lube so a bit of Krytox and wax goes a long way to extending their life. Some Teflon spray is also usefull--- even with the Time pedals I used to spray the stainless steel plate from time to time with some Teflon.
Unclip side has gone through three cleats compared to no breaks on the other side. Properly installed. Properly maintained.