Here are the things that get me, and maybe it's because I haven't configured it well yet.
1. On firefox first start-up is slow after unlocking to actually find a password for a site. The interface says, "No logins for xyz.com" for maybe 5 seconds before the login loads.
2. Along those lines when I open it first thing in FF the box for its password isn't focused and I have to click it.
3. The keyboard combo to open it also only works in Chrome.
4. To add a new login I have to go to the site. I haven't figured out how to do it from within the plugin.
5. We get alerts at least once a week about service disruptions but they don't seem to actually affect me.
6. I like Bitwarden's command line tool but I bet 1Password has something at least as good that I haven't found yet.