I'm ending year two of an experiment whereby I do no maintenance on my commuter bike (nexus 7 rear hub, dynamo generator front hub). It's been pretty much rock solid. I don't clean, grease, or look at anything other than tire pressure. All my kids have, or are getting nexus-7 equipped bikes. I have also done a week long tour (Wisconsin) on a nexus-7. The range is a little limited for touring, but it was amazingly sufficient. If you're willing to sacrifice down below a 90 gear-inch top end, you can get a sub 30 gear-inch low end for steeper hills. I like these things.