I haven't and wouldn't want to in the places that I have toured and with the load I carried, since I used the highest and lowest gears a lot. That said It depends on what you are carrying and where you plan to ride which you don't mention.

If you aren't going to be doing mountains and don't mind not having a high gear then it might work for you. Be careful though I know of one young rider who thought he didn't need low gearing. He kicked everyone's butts on the climbs, but... He only made it 1000 miles into a 4200 mile tour before taking the bus home due to a knee problem. A year later and a surgery and lots of therapy later he is finally hoping his knee is sorted out.