I've had these for at least a month. I've hiked up a tropical volcano in them and I've braved Midwestern winter in them.

Virtually no break-in. Fantastic tread. There were a few muddy situations where i probably would have broke a leg if not for the aggressive tread. Sole is pretty stiff, shoe feels nice an padded.

Concerning tropics: despite the claims to be able to vent moisture my feet still end up quite hot and sweaty.
Concerning winter: These things keep my feet nice and warm, despite slushy situations i have not had any water seep in.

My only real beef is that i have a few (*updated, quite a lot now) errant threads popping out around the toe area.

Not a bad shoe, i'd consider Teva again.