I have been wearing Birk clogs off and on for 20+ years. I always seem to come back to them. They take a tiny bit of time to break in, but then they are perfectly formed to your foot. I then proceed to wear the same pair for years. If you have a shoe repair place near you, they can resole and recondition your birks pretty darn easily.

One hint from years of wearing these is make sure you keep the cork beds in the back of the shoe coated with a sealant. There are products out there for this. Just reseal the cork like twice a year or something.