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We made the transition from New Holland Haybines to John Deere disc conditioners several years ago. The first switch was to disc/rubber rolls and we were very happy with them. Then a couple years ago we traded them for ones with the impeller conditioner and we're thrilled. You can adjust the impeller to barely touch the crop, or to shatter heavy stems for extra-fast drying. We've had pretty good luck with them as far as rocks go. When you do catch a good-sized rock, usually the worst that happens is you bend a blade and have to stop for a couple minutes to swap it. It takes quite a bit (big, big rock) to actually shear one of the pan drivers, and those can be changed pretty quickly as well. Biggest complaint would have to be the crappy flashers JD chose to put on this machine. The bulbs are too fragile for the application, and if the bulbs don't break, the colored lenses fall off. That's about it. No real service issues and they'll slay hay all day. I especially like that the heavier the crop gets, the better they seem to work. I can't speak for other disc mowers, because I haven't tried them, but we're very happy with these 935's.
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