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Injector vs DE blade longevity?

I was wondering, how many shaves do you get with an Injector loaded with a German Schick blade or a Featherjector compared to a good DE blade?

So far, I seem to get about the same results although there is only one edge on the Injectors.
Schick used to advertise that their injector blades were 2-3 times as thick as a DE blade. If that is true, perhaps they hold an edge longer. So, maybe their useful life is about equal.

Thanks for the feedback. First, I would have thought that those would have lasted half the time of a DE.... Well, I guess I need to go try one now.... :)