Commuting - Internally geared hubs?

In general and Shimano 7-speed in particular... Could someone point me to good source or briefly explain what are dos and dont's with them from a rider's perespective?
Can I shift anytime, or should I stop pedalling for that? (shifting while pedalling makes quite loud "bang"...)
How often it needs to be checked over?
Any other things I should know?

You can shift whenever you want, but if you're pedaling hard, you'll need to let up a bit.

As for servicing, Shimano uses a special oil, and you can screw things up if you use the wrong one. I'd take it to a shop. But they rarely need attention, other than the occasional cable adjustment. In ten years, I might think about having mine looked over.

You can shift whenever you want, but if you're pedaling hard, you'll need to let up a bit.

As for servicing, Shimano uses a special oil, and you can screw things up if you use the wrong one. I'd take it to a shop. But they rarely need attention, other than the occasional cable adjustment. In ten years, I might think about having mine looked over.

I've got 4200 miles on my Shimano Nexus 7 speed and haven't done any maintenance. I've ridden through 3 winters with it. I replaced my chain, but that was it.

If you let up when shifting you shouldn't hear any "banging" of gears.

I would have it regreased every year or two though and have the bearings changed at the same time.

They don't require much maintenance but they do require at least some.

Thanks everybody :)