I've used MTB shoes since going clipless on road, touring and MTB bikes, but I opt for Time Atac pedals and cleats.

I also have a pair of road shoes with Ultegra platform pedals and cleats. My one experience with a flat tyre quite close to home and the walk in the shoes showed up a weakness that for me makes them unsuitable for touring -- the wear on the cleat from walking on a chipseal shoulder was a lot.

With the MTB shoes, I can walk, hike, loll around in camp... and most of the shoes I've had have been incredibly comfortable for me off the bike.

Just before our Canada holiday in August, I bought a pair of Shimano sandals, something I have intended to do for four years. My jury is still out on them... as much for footbed fit as anything else. On today's ride, I opted for shoes because of the variability of the weather. Perhaps with summer coming, I will wear them more often.