I used SaaS pass at work for a while, and it made my day a little bit worse every time I had to use its 2FA. The app's login on push notification thing was very slow, and would fail too often (maybe 5-10% of the time). I ended up using the QR code scanning for 2FA more often than not, but even that was slow, not even accounting for for the time it takes a human to unlock their phone and open the app. Doing thing multiple times throughout the workday was a real drag.

It's a shame, because I think the idea of it is nicer and no less secure than Google Auth, but I'd much rather enter 6 numbers than wait for the app.

Disclaimer: This was around a year ago, perhaps it's improved since.