I've been advised by a dealer that ztr's perform worse on slopes than lawn tractors. I also read the same on Consumer Search's web site (http://www.consumersearch.com/www/lawn_and_garden/lawn-tractors/review.html). I have 11 acres of which about two are under grass, some pasture, some lawn. I have a Kubota L3130 with 72" rfm which is good for both when the lawn is bone dry but, with water filled tires, the tractor tends to cut the lawn up if it's at all wet. I can't drain the tires as I have a front loader which I need to use year round so am looking to buy a suitable machine for the lawn areas. I have some slopes, probably around 10%, and some ditches that it would be really useful to be able to use a ride on to mow. I also have quite a few trees and obstacles I need to mow around. I've attached a shot of the major area of lawn. The pasture is a good deal rougher. I'd appreciate advice on the performance merits of ztr's vs. lawn tractors. I was looking at the Toro Z500, the Exmark and the like but perhaps these machines aren't suitable?