These used to be a byword for trouble-free cycling but there seem to be lots of reviews of the current versions with freehub failures after a few thousand miles. Even XT ones seem to vulnerable.
Is this just internet amplification of a small problem or is there a real issue with the current generation of Shimano rear hubs?
I need a reliable 36-spoke touring wheel and XT seems the obvious contender. The new version FH-M770 has an aluminium axle. Is this a bad thing?