Go for it. You'll wonder how you survived so long without one
I made the jump two years ago. It was either that, or a 4k monitor - so glad I went for the Ultrawide instead.
Check the link in my signature, all my Planet Coaster videos are captured in 21:9, everything scales perfectly - I wish more games worked this well in 21:9!
My monitor isn't sold any more, but this is
the current equivalent model.