And that’s all it is, your opinion! If you’ve never personally tried double blades, you really don’t know what you’re talking about, do you? I was skeptical, too, but now I’ve been running the Ballard X-Blade system for two years with no problems whatsoever, and a much better cut at higher speeds than single blades. I don’t mulch, though.In my opinion doubling up blades is a DYI guys stupid idea. What can go wrong? Can’t properly tighten blades, may come loose. Destroying the spindles. Not made for two blades. Safety, may destroy the deck or blades go flying. Don’t even give that idea another thought, you’re asking for trouble. Who ever posted that or is thinking about do it, should have a frontal lobotomy ASAP, and should loose his manhood.