Any reason these are more special than any of the many other options on Amazon?
Don't make the mistake of getting a slightly cheaper one on Amazon. I bought a random one (with good reviews) from Amazon and it doesn't work on the plane.
Also, someone posted about one melting when using it on 220v. (It was also a random brand)
Proceed with caution but the hot logics seem to work for many people on 220v, myself included.
TL;DR It's worth getting the real deal