We were using this for a while to do meetings for sr.ht, but we recently switched to - believe it or not - Mumble. It's old and unsexy but damn it's reliable.
Our problem was that we had way too much echo/reverb, especially when people were not using headsets. Just having one non-headset user killed it for us. IIRC even one user talking into their phone normally (i.e. no "loudspeaker" setting activated on their phone) killed our conversations because people heard themselves talking. I've tried finding a setting that would be OK to use when no headset is available, but I just couldn't get it to become bearable.
I'd really like to use something self-hosted, but I can't control what devices people use, and users are way too used to simple interfaces. I've also tried a self-hosted Jitsi meet instance more than a year ago, which for some reason has much better echo reduction, but it sometimes didn't work for one or two of our colleagues for unknown reasons, maybe because most of us have Firefox, not Chrome, or mobile browsers. The android app didn't work on my Sony Z1, but I've since changed phones and it seems to work now.