I've commuted for the past two years with a nexus 7 equipped bike with no problems whatsoever. I've put 11 000 Kms on it and it just keeps on running like new. I disassembled and re-greased it at 7 000 kms, to fiddle with it and see the little gears inside. There was no real need for an overhaul, but I'm a curious sort.

Anyway, good stuff.