FluentStream VoIP vs Microsoft Teams

Nothing really. Some things are a little harder to find compared to the bigger systems because they're a new vendor. But they're constantly upgrading and making the system easier and easier to use.

I have nothing negative to say about FluentStream.

Very few complaints, but some of the settings can be difficult to find / tweak (i.e. notifications, sounds/alerts)

My only complaint would be it can be a little slow sometimes, but other from that it's great.