A great pick, and a pleasant surprise.
I've tried dozens of picks lately after switching to lighter strings. At first I passed over the Flex because it just looked like something new and gimmicky. Then I read the description and ordered some .73s.
These are very much like Dunlop's description: the character of regular Tortex, but with the warmer tone and flexibility of nylon. And that can be a very good thing in many cases.
I love the regular Tortex yellow 73s, but on an acoustic, they can seem a little bright and "clacky" off the strings.
The Flex is a great solution to that!
Certainly worth a try.