I use to think they were worthless until I had an employee almost drown. They definitely have their place. He was mowing along the bank of a lake that dropped off 2-3 feet which he had done 100 times before. the mower lost traction and he went over the bank at an angle and the zero turn rolled upside down. he had the ROPS folded down that day and his seat belt on and ended up getting pinned between a large rock and his seat with his head being under water. It took 4 guys to lift the mower enough to cut the seat belt to get him out. He did end up passing out but ended up with no broken bones and was OK. Our new rule is when mowing any slopes, the ROPS has to be up and seat belt on. If the ROPS is down, leave the seat belt off.