I have owned a 9.31 treadmill since last February and the unit is wonderful
It is solid and my wife and I enjoy using it .The running board is firm with
just the right amount of give and the controls are easy to use .
The only complaint about the unit is that we feel the pacemaster that
we owned before had better electronics if you paused the pacemaster
it would go back to the speed you left off at instead of making you work
your way up.I feel this unit will give us many years of use