I have noticed the suspension springs on some more expensive ZTRs. I have owned 4 different cheaper brands without springs, and liked them. But, they are rough riding even with pillows and a suspension seat. Some of the ads point out that you can go faster with them. That sounds likely, but I don't go that fast when mowing for myself. I do have some trouble with Moles. It is unblievable how rough they can make the ground. I see that our dealer has Ferris, Toro, and Simplicity, I believe is the names, of mowers with springs. I don't see them at box stores yet. Just wonder how much they save your back. I have run the thought past my wife a time or two. When I mention the price, her expression telegraphs her opinion. If I have enough healthwise positive response, I could use it for a reason to stay out of the rest home longer.