Yes, thanks. Somebody mentioned it here before, looks good.

Not sure if it can do video conferences with E2E encryption, because that could be very difficult (impossible?) or bandwidth intensive.

Now I just need to convince everyone to switch ;)

Oh, just one thing. Its apparently missing a desktop client, that isn't a web app.

I could convince more to switch if chat managers like gajim/pidgin etc. would support it out of the box.

It is not, check http://matrix.org/docs/projects/try-matrix-now.html

Vector Desktop an Electron that wraps the webapp and matix clients without videoconference support.

It's a good start.

Tensor and Quaternion, actually.

Tensor and Quaternion has video conferencing support?

From what I read, they are only matrix clients, not vector clients.

Vector is a client for the Matrix communications platform (perhaps calling it a communications platform is wrong, it's more general than that).

Matrix itself is just a spec / API for sending and receiving messages. Tensor and Quaternion are two other clients that work with a given Matrix home-server. AFAIK all of these clients can utilize Matrix APIs to some degree, however I'm unsure about video conferencing as I only really use Vector. That said though, other clients' capabilities don't really depend on Vector at all, unless they're using https://vector.im as an identity server.