I wrote about my experiences with JMP Chat and the Dino XMPP client back in 2021:

https://thenewleafjournal.com/sending-sms-messages-from-my-computer-with-xmpp-through-jmp/

I stopped using it in the end because, despite being a nice service, I didn't have enough of a use case to justify the continued cost. While I like XMPP, I'm more or less stuck with SMS in real life because almost everyone I talk to (one exception) just uses iChat for everything.