I've had those very Shimanos on my Fisher for 4 or 5 years and have had no problems with them. I would agree with those reviewers who talk about the "platforms" not being very good for non-cleated shoes. I don't know what exactly their problems are with them, but for me, the cleat engaging mechanism in the pedal never pushes down completely below the plane of the platform edges. I suspect that was an intentional design feature, otherwise your cleated shoe, if not precisely placed over the pedal, could push the mechanism down far enough that the cleat wouldn't engage before your shoe tread met the platform edge.
But I never ride the Fisher in anything but cleated mtb shoes anyway, so it's never been an issue with me. Durability has been fine, too.