Reading back when changing frequency

[jtor]

Controllers: What do you think when a pilot doesn't read back correctly especially when changing frequency? Do you want to get a proper read back or is it enough to say just "bye".

Do you accept the first one at all, do you just prefer the second one or is it what ever:

1.
Controller: "Scandinavian 1912 contact Stockholm on 118.2."
SAS1912: "Hej då (bye)."


2.
Controller: "Scandinavian 1912 contact Stockholm on 118.2."
SAS1912: "118.2, Scandinavian 1912. Hej då."