LastPass is the last thing you should use. It got hacked in 2015 and 2016:

http://lifehacker.com/lastpass-hacked-time-to-change-your-ma...

https://www.hackread.com/lastpass-hacked-this-time-for-good/

For clarity's sake, they were hacked once and in separate instances had vulnerabilities reported to them by security researchers, which were then fixed.

I don't know if it's more or less secure than other password managers, but it certainly isn't the last thing you should be using.

There are mitigations and best practices for using any password manager, including Lastpass. I don't think any of them are immune from attack.

Another happy customer here.

Notable features that I like: automatic password changes, security challenge (warns me about weak/previously used passwords), primarily web-based (works equally well on Linux).

Me too, but looking for another solution.

Can you share why?