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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.
Hefty-
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
We need more info!
Slide and pivot doors also an option. The slimness of sliding doors with the ability to fully open like bi-folds. Each pane slides independently to the opening point and then pivots open so a different technique but removes the clunkiness of bi-folds.