Well, looking at prices and the fact I run a basic Cup Machine motor only, I decided not to buy the aluminium one, yet. I ordered some bits and pieces from Banzai and included the gears, bearing, shafts, and the plastic set for teh gearbox. All very cheap.
Here's a clip of my TT-01 on the mixed carpet track. Unfortunately the camera was pointing a bit sideways, so my yellow Ferrari is hardly visable. But you can see how narrow the track is. Imagine we were on track with 14 cars at peak.
Hugo