I’ve made good use of my Keen Commuter II cycling sandals since they arrived last Christmas. I fitted them with MKS cleats & I’m very happy with them for cycling. What I wasn’t sure about is how they’d go for their “other uses”? That is, bush walking & beach wear (after all, when I’m traveling – especially in our VW T5 Campervan – I want to minimise the variety of footwear I carry).
Early on they got a workout for bush walking & they passed the test very well. The toecap & stiff sole both give good protection & support for rough surfaces. I can now report on their use as beach sandals & they didn’t pass so well. Sandals & soft sand are ok for me but the toecaps retain the sand too much. As for the water test, the upper material took far longer to dry than my usual Teva sandals (& what does that “waterproof” label on the Keen sandals really mean?)
Aussie on a Brompton 
Ha — it never occurred to me to wear these at a beach! But then, you have far more fanstastic beaches than those to which I can get easily . . .
I wear mine as walking sandals when I travel in warm climates, and like them very much for that. (When traveling, I want my toes covered against potential scrapes and injuries.) The soles are stiffer than the same model of regular Keens, but not so much so that they bother me, and I do like the convenience of having to take only the one pair.
I think “waterproof” means “will not dissolve easily in water”!