I have not. I actually don't want to experiment too much because I want to chat with other people, so popularity is really important to me. Session seems like it has a small user base. Telegram is the default in my local btc groups, which is a bummer. I may push people to move to signal. I've heard that Matrix.org is working on UX improvements to make things easier. If that turns out well then I might start pushing that.

I just looked at the google play store for download numbers: Element: Over 500k downloads Session: Over 1 million downloads Signal: Over 100 million downloads

Signal absolutely DOMINATES.