My JD riding mower has been a $4000 steaming POS since the first year I bought it. I think they only made that model for like 18 months. I bought it in 2004, and I've had to replace the transmission (first broke at the end of 2007 season with less than 200 hours, drove it until it totally died early in 2008) and one (soon to be two) front spindles this summer. Thank goodness I found a place online that sells the transmissions for cheap. The dealer wanted about $1000 for the part; I bought it for about $250 shipped. It took me about 30 minutes to install it myself - it is a hydro unit, so it's just a belt, linkage and about 6 bolts once the tires are off. The Kohler engine is the best part of the whole thing. I've had multiple bad experiences with the dealer as well.
My grandfather who farmed only drove Deere, and my other grandfather work at the engineworks in Waterloo. I really wanted to like my little green mower, but I just can't do it anymore. Maybe their ag tractors are higher quality, but I'd be very hesitant to buy another green machine especially if it cost $100k+ and my livelyhood depended on it.