My bike is equiped with a nexus 8 gearhub. I've been commuting on it since feb 2005 every day all
types op wheater. I've now almost put 5000 miles on it without any significant problems. There where only
2 minor adjusments first the cable has been adjusted once after the first 300 miles or so. And last february
exacltly 1 year after buying the new bike the chain has been replaced by my LBS during yearly maintainance
because it was strecthed to far to tighten it.

So all with all it seams to hold up quite well during my 20 miles round trip commute. And I'm lazy so no
preventive maintaince besides lubing the chain once a month.