I spent top dollar on these Merrel sandals about three years ago, even after they were reduced forty bucks off the regular price. And what a poor design they were. The two velcro tabs at the back on each side holding the heel counter in place continually gave way, turning them into useless flip flops. So with a little help from John's pop riveting tool, and four rivets, I made them useful again.
In the previous three years of owning them, I probably wore them about 20 minutes total... After fixing, probably 20 hours, in just two days.