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Fineo is an odd one. Great from a technical perspective but maintains a minimal spacing between glazed panels through small black plastic spacers at 1” centres so in reality looks like spotted/gridded paper. Great for industrial buildings, less so for more twisted traditional building stock. From memory, it also has a super wide seal around the glazing perimeter pretty much making it unsuitable for typical timber window frames.
EstelleGetty
There's also vacuum glazing units (Fineo, Spacia etc) which are ~8mm total thickness with similar U values to triple glazing.
V spenny tho.