Back in the late 1960s and early 1970s all sorts of wierd and wonderful frame designs were used. There were some not too dissimilar to this and maybe some of those [even older than me] who drove back then may be able to shed some light as to how effective they were over the traditional coke bottle design that's pretty much prevailed throughout.
Based solely on seeing these pictures, the "I reckon it'll be quick so I'll buy it" stance is the kind of thing I'd expect from somebody with a vested interest in selling them or somebody very naive. With something as radical as this, I'd strongly advise waiting to see how others fare with it before parting with your folding stuff.
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