Matrix has been on my to-do list for some time - I'm interested in exploring it as a replacement for team Slack.
As a side-note, I think the copy on the Matrix website could use some love - it's a little wordy and not immediately clear what Matrix is, and why/how you would use it. I've read a few other commenters make the same point.
Are you open to some suggested wording? If so, how would you prefer to receive it?