I've been debating making this switch myself. How time consuming was the transition? Did you have to do much manual data entry or does bitwarden have the ability to reliably import lastpass data?
There is a [KB article](https://bitwarden.com/help/article/import-from-lastpass/) about exporting your LastPass vault and then importing it into Bitwarden.
It only took a minute or 2.
The most annoying thing for me is that Bitwarden doesn't have support for all of the extra "credential types" that LastPass has. They are still imported, but everything that isn't supported is imported as a secure note.
So far the only issues I have had logging in anywhere has been logging into my firefox account (in a new browser), and home assistant.
Shared passwords aren't included in the Lastpass export, at least at the time I last exported from Lastpass.
The only functionality I do miss from Lastpass is the option to generate the short pronounceable strings I use to create usernames, like the one I'm using now.