I love my Birky London clogs. And yes, you really have to break them in. This may take some time to. I wore mine everywhere for a little while. Not the best fashion statement but oh well...
Don't hate me, but I find my "shoe system" has more than helped with the back issues I was struggling with before. I change shoes once a day at work. I have like 5 pairs of Danskos, 2 pairs of Troentorps and One pair Birk Londons. I like the arch support in all of them, and some have inserts as well. I believe by constantly changing shoes my back is put more to rest, with minimal stress. Whether that's a reality or not simply doesn't matter. I've had extremely terrible back issues in the past, missed a lot of work, was semi immobile for a period of time, yada yada.
I buy all my shoes off eBay. No, not used. Always new. There's usually a new pair for $40 or so popping up from time to time. Hopefully none of you guys wear the same size I do, as I sure don't want to ruin my little bay "secret"