I love the Saito 100s performance it gives my UCD. But the bearings does not seem to last long. I have a month old Saito that has gone thru 6 gallons and it's already off to horizon for a bearing replacement. I use 30 drops of after run oil every day of usage. But I guess torq rolling and hovering 8 minutes out of 10 minute flight time would kill any engine quickly.