The one thing I wished I had considered prior to purchasing the x320 4 years ago was that the k58 tuff torq transmission is not owner serviceable, not sure if this applies to the models you are considering. Have driven it up and down bill hills on 2+ acres for 180 hours, and it has slowed down, ultimately suggesting the transmission need to be serviced, after replacing belts, verifying linkage, etc. My options include having the dealer do it, or follow various work around posted in the forums to enable me to chnage the trans fluid. I would personally not buy another machine that did not allow this basic maintenance feature out of the box. Hope it helps.