I have never used a impact wrench for removing and reinstalling blades until today. I am kicking myself square in the ass for having not had one when I owned my business. All those years of getting under the #$$%% deck, trying to wedge the ##$%$% block into place to stop the ##$$$ blade with my #$$# bad shoulder, then trying to position myself to get enough #$$%#$ leverage to remove the #$%$$ blade, then repeating the #$$## process to reinstall it, then again repeating the whole #$#@#$# process again for all the other #$@## mowers. Oh man how I hated the inner blades. Using it today was just incredible. So easy so fast. I would say it would have saved me at least 10 to 15 minutes a mower had I had it when I was doing it on a regular basis. After reading suggestions on here to use one I asked for a impact wrench for my birthday - which happens to be today. I just asked for a cheapo from Harbor Freight. This is what I got http://www.harborfreight.com/cpi/cta...emnumber=96448 from my parents. I asked for the cheaper model you have to plug into a outlet, but my dad went and got me the nice cordless model. The only thing I am worried about is the quality and life of the battery. Im to old to get birthday presents but I cant convince my parents other wise lol. If I was still cutting grass day in and day out I would spend the $$$$ in a heart beat and get a high quality one like a DeWalt brand. So if you cant make up your mind whether to get one or not - my suggestion is spend the money its worth every penny.