I don't know about the Kena's, but I have the Terra and they are the best Sandals I have ever owned. My mom bought a pair for everyone in our family for our disney trip and they are now the first thing packed. I haven't had a blister or sore feet yet with them. They also dry super quick when you are "the" seat on KRR.
I am looking at buying the Teva Universals before my next trip.