wow i am having the direct opposite experience.
signed up for fi last weekend. ported my number from verizon to google voice. since then, two things:
when someone leaves me a voicemail i get a texted transcript and another alert i can click on to listen. then the VM disappears. now that i am overseas i get the text notification but can not listen to the VM or find it anywhere between voice and fi. i worked on this for 2 hours today from london with google fi support. it was never solved.
worse, when i arrived in london today my phone had no data. once in two hours it connected somehow and i suddenly got a bunch of emails. then eventually google support told me to manually select the network. that worked and after 2 hours on the phone with fi support i left my hotel. i went to a store a km away and when i tried to send a pic i received a notification that i was no longer connected to the network. no data. i manually selected a different network that seems to be working now. but i am dreading going out into the city tomorrow to explore. without google maps and google search i'm dead.
i don't know what to do and may port back to verizon to sort it out. i'd rather pay a ton of money to verizon and reliably receive messages than save money without any reliability.