I had some trouble with the Birkenstock sizing. The first ones I ordered were the Regular width, which look fine as sandals, but in the shoe form I looked like I was wearing clown shoes:
To be honest, this is what attracted me to the shoe in the first place, but I wasn't ready for such an extremely wide footbed. So I ordered the Narrow version, which still has the clog look, but doesn't make me look like I have flippers. I feel like I ought to go one size up, but they're sold out of size 43s online, so I guess thats that.
Narrow on the left, Regular on the right.
And the Gurkees are just awesome (and im definitely not a sandal guy, I swear):