I have the Novara Gotham. It has the NuVinci hub and Gates Center Track belt drive. For an all around, just get on it and go bike, I wouldn't go back to a chain. Tire changing is not a problem but I added Slime inserts anyway. Although I don't have to for changing a flat, belt adjustment is really simple with an eccentric BB. Disc brakes are another plus on this bike as is the Dyno hub/lights. It's upright and comfortable but still very nimble to ride. I thought it was going to be pretty slow, but was happily surprised at how well it goes for a heavy bike.
On my mountain bike, fast road bike and touring bike, I wouldn't go to an IGH. Too heavy for the mountaian bike and road bike and I like standard parts that would be easy to obtain while touring.
All that said, the IGH and belt are a fabulous combination for commuting and banging around. The price is not inexpensive but I will keep this bike for many years, so I consider it a really good investment.