Cathay Pacific had these on their B747-400's as early as 1992, and they folded up flat under the seat bottom of the seat in front, thereby not restricting leg space. I'm just under 6 foot 2, so the footrest is far too short for me, which would be fine if only it would fold away flush with the seat. Instead it protrudes and winds up bruising your shins as you struggle to find a comfortable position. In SIA's favour, I have to say the food and entertainment were both pretty good. I personally am fed up with the attitude that if you distract your customers with loads of entertainment they won't notice substandard legroom.
Quality is in the eye of the beholder and everyone is entitled to a different opinion.
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