This is an excellent add-on, because it works in all of my platforms, all my PCs. I can share passwords with my family (have paid for the family account and it's definitely worth it), I can use it via CLI if I need to login to my remote system and can use it to generate secure passwords with a variety of rules.
I also *love* that I can setup my own container and point my apps towards it, giving me 100% ownership of my data, however I find that unnecessary, as I am very satisfied with the online version.