Out of the five password managers I have tried, its been by far the easiest and most reliable. Admittedly, I'm new to password managers, and with the exception of Ipass all the others have been additions to internet security packages, and I have found them lacking, with intermittent failings, but Nordpass has never failed me over the last 18 months. It works on my linux pc's just as well as Windows, and even has a non web browser (stand alone) version for networking logins. The email masking feature is a really useful feature meaning I dont have to share my email address with everyone and helps to stop spam.
Update: A year on and having moved to linux, I still find Nordpass the pick of the bunch, but I dropped my stars to four because there is no longer a desktop app available to me without going down the Snap route.

It usually works well, but sometimes it doesn't fill in fields and I have to copy/paste my password from the application.

Works as intended... most of the time. The only issue I've come across is, sometimes I will have to sign in multiple times in order to actually get into the extension. Otherwise, pretty solid. Autofill works like a charm. Seamless transition between desktop and mobile. Passkeys also work beautifully.

So far I'm having a good experience with the Nord Pass extension aka add on. I haven't had any problems so far. I like that it also will update any information as needed in the vault. I'm happy with it so far.

Perfectible but good enough to keep. It should, by default, offer to clear Firefox's saved password database (or import/merge it).
Too many "false positives" when updating information - something changed in a field, fine, but which one? And why can’t I ignore updates on a given page?
The "new password" prompt is annoying: I have a better generator, but it's impossible to disable this one.
If there’s an option to automatically check "Stay logged in" boxes, it’s nowhere to be found. Not to mention websites that show a login prompt even when you're already logged in...
The handling of shared passwords is pretty poor - for example, professional sites with LDAP-based authentication, all using the same password.
LDAP connections should have their own category, with each site able to allow (depending on the case) login by username, email, or domain\username, always using the same password, of course.
Ideally, it should include an Authenticator feature to enable complete login without requiring a third-party tool: passkeys aren’t universally supported or always reliable.
There should be an option to manage API passwords for certain sites, storing a reusable copy as needed.

There's definitely room for improvement, especially on the mobile side. Coaxing the app to fill passwords can sometimes be a chore (mobile), and the fact that on desktop, the passwords can be hidden by the browser prompt (should you be using that as a backup) can overlay NordPass' prompt. That said, the interface is very clean, the price is very reasonable, and I feel like they're making strides to make the product better.