I set up a server on my VPS last week, and my wife and I switched our chat to simplex. Works perfectly. It's ready for the big stage.
Discussion
Not sure about big stage. Seems to not scale well just yet.
Scaling in a sense that many users overwhelm the standard servers? I wouldn't know, I only use my own server with two participants 😅
The UX feels like early Telegram, there are many little things that can and hopefully will be added in the future. Like video compression when sending video, compressed by the sending device of course. It would also greatly decrease the xftp server's network traffic.
I like how Telegram does it:

Merci
Idem pour être en ligne avec mon ami qui semble obnubilé par nostr surtout pour toutes les possibilités de créations P2P ou groupe..🙍♀️