Buy it, had one for 5 years and was very reliable. Made my 5.25 viper go like a rat out an aquaduct
even with seven lads on board. Should use about 8 gallons an hour at speed. Design hasn't changed much in 20 years so lots of spare ones about even if you do wreck a gearbox. I always used good quality 2 stroke oil (quicksilver) in her and did the servicing myself. Nothing complicated.
Pete