Very useful for frequent flyers and all that the "in-flight entertainment" do not want to spoil the crummy headphones the airlines themselves. Combined with good, sound-insulating headphones makes this small adapter to a life much more pleasant - finally understands the dialogues in the movies and can keep out the aircraft noise. Thanks to the low price is worth the "investment" even if you fly only occasionally.
The adapter Artwizz also seems to me to be quite stable; I had a similar adapter from another manufacturer (no name), which was broken after a few flights.