Any use for Lehner Basic XL motors? Rarely used...

I would imagine that an electric motor has a "sweet spot" wherein it is running at its maximum efficiency. In the case of our 1/8 scale conversions and the motors that lend themselves to that duty, the sweet spot would be somewhere between about 30K rpm and 35K rpm. When you are outside of that range, either because you are pushing the motor too hard, or because you are only using partial throttle, the motor doesn't run as efficiently as it does in its sweetspot.

I'd imagine that with a "good" motor, like a 19xx series Lehner, the motor runs at a higher percentage of its total efficiency when outside of the sweet spot than a less expensive (Feigao) motor does.

The above is what I'm gathering anyway. Am I way off?

As for the segmented magnets, I have no idea how those would affect anything. Perhaps a lesson from someone "in the know" would shed some light.