It looks like most of these only have an inch or so of travel. Do they really make any difference? My Gravely ZT42 kills my back, when going any kind of bumps. BTW, I weigh an average 200 lbs. Any suggestions, besides loosing weight?
They certainly do. Any form of suspension whether it be spring, damper or air cushion will absorb the "shock" from impact with a hard object or bump. Look into the reviews on the Toro MyRide and most people love it. With the seats you have some adjustability, just like with the Toro MyRide system which both can be adjusted to the rider's weight or desired comfort level. My stepdad has the Ferris IS2100Z with suspension all around and it makes a sublet difference on bumps. With such a heavy machine and tight springs there is only moderate impact absorption. The addition of a suspension seat would only improve the ride.