Husqvarna. Idler pulley bracket snapped after 2 months of use. Very inexpensive fix but they said I had to abuse the machine for it to break. I called Husky - told them the situation... they sent me to a local shop where they diagnosed it as a manufacture defect and fixed it no problem!
Its been a beast of a machine, at 600 pounds it was lighter than the competitive models, I just got a lemon. I can't complain about the brand because Husqvarna went out of there way to make me happy...just the shady dealer who took my money.
Last year that tractor paid for itself (and it doesn't get used much). I am happy with the product, just not the dealer I bought it off of.