i started using seat belts on my equipment when i got my skid steer in 1997 - a SS will flat spit u out the front or up into the ceiling if you arent careful. Then my dad was mowing, ditch bank gave way, ended up nearly turning over our 706 - one rear wheel off ground mower in air, thank goodness he had the loader on and it caught and kept him from turning over - my buddies 2-105 White has a seat belt in it and i have worn it for a long time mowing with a Batwing in unfamiliar fields of CRP and when you find a washed out ditch or something you were not anticipating - thank god for seat belts, my former uncle in South Dakota was spit out of the front door of his cab on his Versatile while baling hay and was killed after being run over by the tire and wound up in the baler - my cousin found the tractor still running pined up against a haybale, engine/baler/running and tires spinning, if he had been wearing his seat belt he might still be with us - that was a tuff one to bear - and uncle jack was a safe operator, cattle rancher.
I have since worn seat belts like a car - every time and off/on like everyone else but it only takes once like the pto issue on my deere and i was at appx 15mph road speed on asphalt headed to the neighbors when it all went wrong and bound up the machine and it was so violent of a stop my feet flew forward off the pedals, my hands came off the steering wheel and i would have launched for sure right over the hood, my hand went up/out like i was jumping off a diving board - thank god for that seat belt - its just second nature now for me i dont even think about it and i know where the button/latch is it just happens same as pulling the overhead arm down on a skid steer, you just do it like pushing in the clutch before shifting - i love my seat belts!!!!
For each his own, i dont rag on anyone for choosing to do what they do but for me its a must and i have had more than one incident that i am so glad i was wearing it not only in my car/truck but on my equipment