I was wondering if it would be better to keep my blades sharp when bagging leaves with my Lazer Z w/Ultravac, or just throw a junk set of blades on and replace them maybe 2 times with my other sets of junk blades? In the years past, I just put on my trashed sets of blades for doing cleanups, since sucking up leaves with a mower would destroy a good set of blades. And never really bothered to sharpen them. Even though I still give the property its final cut, the cut grass with the trashed blades seems to look decent. So, how do you guys deal with blades for fall cleanups? Would sharpening really be necessary?