This looks really useful!
I do have a few things holding me back from switching over to it right now:
I think that it is useful to store other things in my password manager that can't be generated, such as TOTP codes for 2FA. Or the answers to "security questions" that I've completely made up so they can't be "social engineered" out of me. So having some area where I can store "secure notes" would be nice.
Also, they allow you to customize some aspect of the password generation, such as whether to include special symbols or not, but I feel they probably need to allow some more control over that customization. Because some places have crazy restrictions on passwords, like, you must have at least one special symbol but only from a limit set of special characters, such as ~, $, and %. But something like & is not allowed and is considered invalid. As it is, if you're unlucky enough to generate a password that has the invalid special symbols, then you're out of luck with LessPass. Then again, maybe this can be resolved simply by increasing the counter to generate a bunch of them randomly until you finally get one that works.
I'd also like it more if there was an app (for Windows, not for phones) for it rather than having to access it in a browser. But maybe since it is open source it wouldn't be too much work to fork it and implement the code into my own desktop app.