I have a JD 48C deck with both the mulching kit and a Power Flow Unit. The gators work better with the Power Flow Unit than stock JD blades since they do not produce high lift blades for the 48C deck. However, the blades scrape the mulch plug because of the saw teeth on the back edge of each side of the blade. The Gators wore grooves in the plastic mulch plug as a result but not a complete deal breaker other than a little extra noice now. I could continue to use them with the plug but most likely will switch back to the JD mulching blades before I cut my grass the next time. A lot of folks swear by them and based upon my experience with the Power Flow Unit I can recommend them but if you want to use them to mulch then you need to consider my experience with the mulch plug. If you are content to side discharge, then there will be no problem with scraping but you won't get as much mulching action as with the plug. I believe some other brands or maybe even other JD decks can use the blades with a mulch plug which should give better results.
My brother had them on his Simplicity broadmore and thought they were great but found out with his bagger they would not suck up the hickory nuts and stuff as good as the standard bagger high lift blades.
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