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I recently acquired this group of used Slot.it motors and wondered if there was any significance in the different coloured endbells? Can anyone rank these in order of revs/torque or 'desirability' please?

There are two different shades of orange and three of brown. 

I've heard tell of the 'notorious' dark brown endbell too. Notorious why? In a good or bad way and are any of these considered dark brown?