Yes - we used a whoopie sling for the ridge lines for few months. Finally decided that we didn't really change the length and so the whoopie sling was overkill. Also, the whoopie sling did change length once during packing up and setup.
So we finally just found the length we like and made the ridge line fixed with an fixed eye spliced on both ends.
I think the whoopie sling ridge line is great to experiment and find the ridge line length you like and then swap it out for a fixed length.
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