I ran one for 11 years, 100 tonne a year, still have it. It is a great design, one motor runs it all, in a pinch you can disconnect the module and run straight power to the motor and get through the night. The conveyer is a superior design to a pintle chain, you don’t get a sporadic flow at lower speeds it’s constant. Shear pins on the rollers were a pain to change due to them being covered by the belt and you have to remove the belt to get at them. I changed mine 3 times in 11 yrs. A better design would have been to make the roller rods longer with pins on the outside of the track .
Spreader control is easier now, but there are few electrics that run on one motor. You have 1 spare on the shelf for emergencies, it takes 15 minutes to swap. Get it rebuilt for a couple hundred bucks and it becomes your spare.