I have a busted Stage III in my toolbox. It grenaded itself, blew a large hole in the cover and munched a gear. That would never happen to a 4G, it's a more efficient transmission and not filled with straight-cut gears.
I have 3K miles on my 4G. I doubt a Stage III will last that long without catastrophic failure. Most don't.
Originally Posted by hondabicycle
So has anyone used both and have results to share?