I'm just over the one month period and thought I would share some observations on Fi so far. Really like the service but it definitely has some hiccups.

- I did not change any settings from my original Google Voice settings and found the systems is still calling my other lines when a person calls. Checked the Google Fi settings and it's showing that I don't have any forwarding numbers set-up. Still working to get that one corrected.

- Service has been very reliable and I've tested across a number of geographic locations (DC, Kansas City, Atlanta, Seattle, OBX). The only location I've had issues with is OBX (Outer Banks of North Carolina) where the phone would switch to 3G on a regular basis.

- When using a WiFi connection, I've noticed that on occasion the system has a hard time routing the calls to me. Had a few people tell me they called but nothing appears in my call logs. This has only happened a few times but something I'll monitor.

- When using the WiFi connection on flights (Alaska Air and Southwest), I was able to make calls and have the my phone act in a normal manner.