Google Fi support is extremely friendly and often almost zero hold time. The actual substance of the support however is very much lacking. Google Fi sent me somebody else's SIM card with my Pixel. It turns out Google Fi pairs a SIM to a specific Google account. So when I booted my Pixel for the first time the email field was pre-populated with someone else's email address (but not the password luckily) and I got a "B010" error trying to activate. This is a very specific error code which I later found out means that I was sent the wrong SIM card (or trying to activate someone else's SIM card). But they didn't have this properly documented so they spent a long time on the phone with me factory resetting it, clearing data for certain system apps, booting in safe mode, etc... before escalating the issue and saying someone will get back to me later. A week later they contact me and say I was sent the wrong SIM and send me a new one. It was a terribly frustrating introduction to using their service. Also seems a needlessly frustrating experience if their support documentation and call back times were better.
I really don't understand how people tolerate this. I can't be without a cellphone for a week, my family and I use ours to coordinate many of our activities.
I've not been disappointed when I've walked in to an AT&T or Verizon or Apple store and said "here's the problem ... fix it". And they fix it!