I don't believe the speed claims, either. Going 40 mph requires a certain power level, regardless of the drive system being used; and it's more than anyone short of an elite cyclist can put out. Fiddling with levers affects the effective development, but not the power requirements. Besides, with that much knee bend, it looks very unergonomic. I'd be happy to put one to the test, but until that time I'll remain unconvinced.