I can only reply as a previous user as I no longer work in the airline/ops business.
I used to work from Transmerica Airlines (formerly Trans International) and we operated a lot of charters flights to many remote parts of the world.
We used Berna radio on a daily basis to get departure/arrival times and also to update crews with Wx and any changes etc. At that time (1980's) we had no internet and also the telephone service to parts of Africa etc were poor at the best of times and therefore Berna was very useful and a quick way of passing ops messages to the crew Phonepatching avioded any misunderstandings which could come about when relaying a message via a handling agent.
I can recalled a few times when their support was first class although I understood they were not cheap to use either.
Rgds clicker