I was hopeful at first. A large VC funded company with a big full time team should run circles around a small open source effort, but their security is still way behind Signal. I was also quickly put off by their "less than honest" marketing.
Edit: found previous discussion, https://news.ycombinator.com/item?id=13132157
Like I recently saw an announcement from Wire that calls are now secure, but they had been advertising them as secure all along! I had even spent time looking through the code but didn't know that calls weren't authenticated. Now are they really secure? I don't know, they said that before too, and the source is so hard to follow. Then I saw a post that showed they weren't even doing cert pinning, which is so basic.
I wanted to like it, but the more I looked the more I felt like "security" was just sprinkled on as an after thought.
https://medium.com/@wireapp/call-security-constant-bit-rate-...