Some other criteria I would be interested in is construction (one piece vs. multi-piece/aluminum vs. steel ferrule/ferrule extending (reinforcing) far out to the tip/blade hardness/blade thickness/ and welded blades vs. locking systems vs. spindley eyeglass screws holding blades that resemble something in my wife' s leg razors.) Already, the plywood and drum tests are interesting from a durability standpoint.