A thought on petrol run motors: the Toro mower I bought is still in service and I was given a replacement ZTR mower called Simplicity. 50" deck, 20hp Vanguard motor. The grass was so thick in the back yard that on full throttle the mower stalled on me a number of times, even at a snail's pace moving forward into the grass. Guess it was left to go a little long. Going around trees is a breeze but it can be a struggle to control on inclines because there is no automatic adjustment of steering - power to each wheel is completely based on the hand controls. So it takes some intuition to navigate the hills. It is a great mower for relatively flat ground with trees. I'll be comparing it to the Toro when it arrives most likely this weekend.