Im a big fan of the b3, especially for the money. the biggest negative is only decent run times. great short track( indoor )engine. it makes alot of power / torque off the bottom. runs much stronger with 30% nitro. I have had success at larger tracks with going up a tooth ( or 2 ) on the clutch bell and running a 086 pipe for top end. if geared right you can run with anybody. great reliability, underestimated performer.