I actually don't know anything specific, but I do know that they work on stuff all the time.
the brushless speedo's are pretty monster, but thats the problem when you move the pole switching operations from the comm/brushes into the speedo... I am sure things will get better but there is so much more load on the speedo when running a brushless.
you can run the sphere with 2 Quantum worlds kit heatsinks on it instead of the sphere heatsink and that does lower its profile quite a bit
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