Pretty cool, Hartley, I'd love to see a list of all the shoes you've tried and your opinions on them! I definitely agree that running in minimalist shoes is different than walking in them, mainly because running uses the forefoot strike and walking uses a midfoot or heel strike. I just wanted to provide a different viewpoint to people for why a transition period might be necessary.
I started off my journey into the world of minimal footwear with a pair of Merell Trail Gloves. I did not find the transition to running in them very difficult, but walking in them took a little more effort. I returned those to REI after only having them a month because the desert in my backyard was tearing up the non-vibram sections of the sole (I walk my dog a lot in a local desert park, a good place to test shoes). Since most of the damage was under my arch, I think it may have had something to do with the shoe being a little narrow in the midfoot.
I then tried the Montrail Rogue Racers, the MT 101s, and the Peregrines and only the Peregrines were wide enough for my feet. The Rogue Racers and MT 101s also felt way too cushiony for my tastes. After several day hikes and 1 overnighter, they are hands down my favorite shoes yet. My longest stretch in them was a day hike of 14 miles, 3500 ft elevation change and they performed great. Like I said earlier, I just wish Saucony made a more minimal version, and with better color choices.
That's interesting/slightly unfortunate to hear about the MT 20s - I have never seen a pair of Minimus Trails in person. I'd still like to try a pair, if for no other reason than to use them as my daily work/walking shoes, but maybe not if they are that delicate. It seems the only minimalist shoes which have good reviews for walkers are the Saucony Hatori and the NB Minimus Life, neither of which could stand up to hiking. Any others good for walking? Inov-8's are too narrow for me; the VFF might be good overall if they fit, but I'd never wear those to work...