I use it and enjoy it. Most of the complaints have to do with there only being 1 master password and being able to crack it if one of your passwords is compromised which doesn't bother me since I use a sufficiently long master password.
Deterministic password managers (stateless) are not necessarily more secure than the normal database password managers. I have linked a HN discussion and blog post about this.
Nobody store your password it's pure stateless, you can access the software by the official website, your website, web plugin, the terminal
see this blog: https://blog.lesspass.com/lesspass-how-it-works-dde742dd18a4