I've been using signal for a while and I have successfully converted all my family and friends to using it. That includes a 70+ year old mother and father.
There have been no issues in using it's function from sending messages to video chat and everything in between.
Disclaimer: I haven't used Signal's iOS app for conversations since 2015 ... because ...
When I tried Signal, it frequently crashed, corrupted messages (requiring a reinstall of the iOS app), dropped messages, etc. As a result, all the people I persuaded to use it stopped and I currently have zero contacts on there.
I've been using signal for a while and I have successfully converted all my family and friends to using it. That includes a 70+ year old mother and father.
There have been no issues in using it's function from sending messages to video chat and everything in between.