I was wondering too if the double blade set up would wear out the spindles faster and make the engine work harder. And too with the blades being expensive and sharpening time consuming. Wouldn't that be just more work and expense? Or does one set of the blades last longer this way? I want to try this set up. But with the profit margin the way it is. On the other hand if you just had to go over the high grass one time it might save money in the long run. Just trying to decide. Maybe I should just do it. Right now i am not having any complaints about grass clippings.