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This is very useful if for example your devices have their HDMI slots angled towards the same side where a cable needs to be heavily bent to connect them. It reduces the need for that and your connection will be tighter.
Used on TV that had HDMI ports in difficult to access place where cables ended up needing tight 90 degree bend. The right angle HDMI coupler does a great job. Just make sure you check whether 90 or 270 degrees suits your need.
My Panasonic TV has 3 HDMI inputs which are on a vertical side of the back panel, so to avoid leads protruding horizontally thus restricting screen rotation being able to connect these HDMI leads facing backwards alleviated the problem.