
Note that like the Z/2, there is some break-in time to these. Yes, they will cinch your big toe the first few times. After a couple of weeks, however, these things fit like a glove, and the straps will "settle" a little with the shape of your foot.
Suck it up, break them in like a good pair of hiking boots, and you will never go back to anything else.
I bought these after having a pair of Z/2's for three years, which I finally go rid of because they couldn't be resoled anymore. Sole wear is the only downside, I guess. On the other hand, huge amounts of grip!
No problems.
I really liked the look, open feel and secure fit of the straps, until I walked in them for an hour. No matter how I adjusted the straps initially, walking causes the straps to cinch down around my big toe, making the fit very uncomfortable. I have essentially stopped wearing these [$]sandals because of it.