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We got them on ours from Sunseeker back in 2016 because they seemed to merge the benefit of bi-folds (ability to fully open which of course we rarely do) with the benefit of PPC aluminium sliding doors and slim sightlines. From memory they were bi-fold moneys rather than fancier products mentioned in here. Thermally they meet all the relevant standards and we've had no issues with seal/drafts. They do have a bizarre opening mechanism which seals te panes together when closing which no-one can figure out so there is that...
EstelleGetty
When I looked at those a few years ago they were way down on efficiency because it was tricky to get them to seal well. They may have moved on of course.