I had a bearing go out of the idler pulley for the deck within a week of purchase. I also had a slight problem (can't think what it was---belt?) on the hydrostatic drive after about 3 years service, but was a simple fix.
I mow two to three lots a week, and one is rather hilly and rough, but this tractor has shown no signs of other construction weaknesses. It's built like a tank. Mows great, and I have the 48" deck. Wish it had the hose adapter for easier cleaning, and although it's fairly easy to remove for service, it's a multi-step process that should be simpler.