As far as I've been using it, a few months, I'm very happy.
Easy to setup, easy to use, easy to maintain, there is a lot of applicantions ready to use (just fill the docker form)...
Something that can be improved is the way you automate tasks. I mean, you can do it using the user scripts plugin, but it should be a better gui to do it, not everyone knows cron.
I think it should be better integrated into the system with a fancy gui, some kind of enhanced scheduler where you can select a default/pre-created task from a list (parity-check, mover, ssd trim, speedtest, check for updates, check for problems ), and a custom task loading an script (check database integrity in a docker container, execute rclone to do a copy to a remote server... ). Everything in a single place and easy to see in the blink of an eye, similar to the docker table.
So I expect to see a better scheduler.