Thank you for the replies. I was thinking the shock system was more for the machine;not the driver.....I was thinking the shock system would be friendly on the machine; less wear and tear on all the parts.  I thought our grass was pretty even, but my husband told me in some places it is pretty bumpy. I thought maybe the shock system would mean more durable ; that the machine and all it's parts would have an easier ride....less stress on the machine and all the parts - maybe that is what i'm trying to say.  I'm probably not making sense....sorry.  
I know it's a stupid question, but is the suspension system for the rider?..or does it have benefits to the mower itself?
   
Right now i think it's between the Ferris and the Kubota - i realize it's totally different machines - not apples to apples - :frown:  As much as we like the Gravely, the dealer is the farthest away....but is still on the list.  Now, if I had a crystal ball to tell me which one last the longest!