PatW
Contributor
My wife uses them. She rarely uses anything but a frog kick. i have used them. I break them if I use a high power kick. But they offer excellent control. As far as being easy on the knees, I could not say.
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Owned both, found the Nova woeful at frog kicking, actually anything other than a flutter kick, which I found it to excel at. I found the Gorillas much better at frog kicking but sold them as my local site is a net/line grave yard and the Novas somewhat of a line trap. Novas definitely easy on the knees flutter kicking. I found the nova foot pocket to be one of the most comfortable I've owned, I have small narrow feet. Good luck with your search.