I don’t know the pros or cons of it vs Nix and others, but one pro is that it also runs on MacOS and other OSs. I’ve never used it, but it’s nice that uBlue offers a simple installation ootb.
Many devs seem to use it regularly, and it isn’t dead simple to set up from what I’ve heard. When uBlue offers an installation, then there is at least one person using it, otherwise it wouldn’t exist :D