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They're pretty much compressionless cable, just more fancy and they only work in short sections.
As for using this on a Brompton I don't think they're meant to go full length as the segments of the alu bits means that they'll sag and not hold shape as good as conventional cables. They're meant to be good for tight turns cabling setups anyways so no surprise here.
That said, I have a set if you wanna have a go.
Installed but didn't like it and back in the box it went, 35 and it's all yours.
Tempted to 'do a Ho Ke' and buy this: https://www.sigmasports.com/item/Nokon/Universal-Cable-Set-15m/34VB