I am looking to trade in my mower for a new one. Im looking at a Gravely PM 260Z or a Exmark Lazer Z both w/ 60" deck. I would like to pros and cons of both of these. I own a '01 PM 260Z right now and that is a great mower if is flat but i mow a lot of rough ground so you are bouncing all over the place. How well does the Exmark handle when your on rough ground? Also does anyone know what the blade tip speed is of a PM 260Z?