The ability to route calls via auto-attendant to agents was nice when you finally figured out the interface. We were able to route calls to mobile devices as well as hard phones. We were getting a ton of spam calls, and we were able to stop them by prompting for an input from the caller. From there, we were able to route to an individual instead of ringing everyone at once. 

We enjoyed having the phones tied to the mobile app and the ability to take calls from our mobile devices. However, it didn't work very well. The app was very flaky and didn't like running in the background even if you gave it permissions. We wound up just forwarding our lines directly to our cell phones.