I bought this shoe to use for rainy day bike commutes and it works perfectly for said activity. If I'm caught in the rain, no worries and I just rinse the shoes at home and let 'em air dry. I use the amphibians on the beach as well. Minor problem with sand collecting inside, but it all washes out. I prefer these shoes to teva-type sandals b/c they are closer to shoes and that means I can run, rock hop, bike, or just chill in them and the ventilation is great since the "portholes" breathe like a mutha.
Added bonus for me: I can hop out of the water and jump on my skateboard and just cruise. Sole is grippy even when wet and wind eventually dries them out as I ride. Good news all around.
I did remove the included insoles b/c I found my feet were chafing along the top of the shoe with insoles installed. More room without insoles and no loss of comfort when insoles removed.