I have used login.gov for my global entry application and I'm actually impressed. The only complaints I have with it are:

1. It doesn't make it obvious on how to add additional u2f keys (you have to go to login.gov explicitly to do that)

2. I still can't find a way to remove u2f keys

But then when I used id.me with CA DMV I'm also impressed by it (granted CA DMV does not require any crazy biometric stuff there like IRS planned to do).