Have you tried using it without a headset? Echo cancelation practically doesn't exist. It's absolutely behind every other voip implementation I used. Clients are half broken, barely integrated, and lose settings all the time.

We use it at work, and 95% of users have issues with it.

I have to open, close, then open again the macos client every single day when I start it because my keyboard shortcut doesn't work otherwise.

I don't even mind the horrible UI/UX if it actually worked as expected.

Most people I know use Discord like IRC during the day. Voice chat if and when they play games. Or big events, like election night or big sporting events. It's not all voice chat all the time.

Mumble has a terrible user experience, especially for non technical users. It also covers a really small subset of discord features, the Voice Chat.

Don't missundertand me, on a technical level Mumble is impressive and can do voice channels with thousands of participants, but on the clientside its just a mess.

I've run a Mumble server for my friends group for a while. It worked fine and had a couple of nice features, e.g. that anyone could create a temporary channel and move there with some people and when they all quit the channel would be removed again. This way everyone could organize as they see fit.

But the audio setup and tweaking was a nightmare. It was the biggest problem for every participant to tune and tweak their levels in a way that would work good, it was very, very frustrating.

The chat was also super barebones and of course no way to stream video.

It also has incredibly low latency, which I've found makes a huge difference to conversation quality.

I think "fantastic" is a stretch. Even Discord's weirdly unconventional UI is better than Mumble and as others have said the practical sound quality is way better.

It would be great if someone could make a modern Mumble client.

No mobile client which makes it pretty useless for a lot of people. I probably use discord on ios more than on pc.

Free as in freedom, even