riley ridd wrote a review of Yakima Evenkeel on January 6, 2014
Familiarity: I've used it several times
I love the convenience of taking these on and off my bars. They do a great job of holding my boat- a 20 foot long carbon fiber outrigger canoe. The beauty of them is that they seem like they'd work for many different sizes and shapes of watercraft.
However, that IS a quite a bit of pressure against them when I'm dealing with wind against the boat and I have had to pull over and re-tighten these occasionally if it's a windy day because they'll move across the bars when it's really windy.
I wouldn't let that deter you from purchasing, however. I'm sure there's a way you could tighten these down even further with tools. I do it by hand, though, since the convenience is a major issue. My boat is long and light enough that I just have to assume that transporting it in variable conditions will always be tricky.