It's fantastic. After you fill your password, the 2FA code is automatically copied to your clipboard. Logging into a two factor form for me is basically Cmd + Shift + L (fill login), enter, Cmd + V (paste 2fa code), enter.

I think it's pretty valuable - you automatically get the benefit of your pw manager recognizing the domain and only logging you in/copying the code if the domain matches what's in the password manager.