Project Fi is very good and I am surprised how well the service works. But are people going to miss the speed and/or availability of service from the carrier they left?
We are going to have to revisit this topic in 3 months to see how Project Fi customers are feeling about their services overall.
I actually went back to ATT but not because of Project fi's poor performance. It was just At&t was faster (at the time) and to be honest I trusted them (weird because 3-4 years ago I didnt). It is going to take time for enough people to build up trust for Fi but once they do it will change the nature of wireless carriers.
I found AT&T better performance and I don't save money with my usage ...I'm currently around 10GB with 11 days to go ...hard to beat my 15GB plan with rollover from previous month ...btw if you have a credit with Project FI you have to wait 60 days for your refund from date of cancel ...
For me, it's not even as much about performance as it is about coverage. I've said this in a million threads on the topic, but T-mo and Sprint just don't exist here. I think I'd be in about the same boat as the author of that article with how much I could save each month, but I'd be running at what the Project Fi page calls "2G". No thanks.
I had T-mo when I lived in Kansas and loved it, so if I was still in that area, I think Fi would really make sense for me, but I'm pretty well stuck in this area now, so unless until one or both of the carriers it relies on add a ton of towers up here (I've heard rumors that the FCC won't allow it, though T-mo's projected plan for 2016 shows most of the UP covered...?), it's just not viable for me to even give it a try.