Hi Vettes11,
Are you considering an add on suspension unit or a complete suspension seat?
The Grammer MSG75 seat is a great seat, but at around $1,000 is a big expense. This seat needs to be connected to the machine electrical system to make it work.
I was about to buy one of these seats when I found a Milsco V5300 seat at around $400, bought a tan colored one and installed it on my Scag Tiger Cub. This is a great seat with many adjustable settings, suspension weight, lumbar/backrest position, forward/aft position and armrest adjustment. Also , the operator presence switch, aka the seat switch, is installed in the seat.
The suspension add ons that are available are OK but they will raise up the stock seat too high for most situations and only give you the vertical adjustable suspension capability.