I had not, just installed it though and it looks fantastic, thanks! The best I'd found previously was a no-annotation script that failed most of the time with a vague "something went wrong" error.
I hunted around for a while looking for something similar. I spent so much time in Slack working remote, that fast screenshots with arrows and notes are critical to communication.
Coming from a Mac environment, I can't remember what the tool was that I used previously but I think it was purchased by Evernote. Flameshot has been excellent as a replacement.