I been using Google Project Fi for about 3-4 months now and very satisfied with it. I recently used it in Pakistan over wifi and made calls and text to US with really good quality.
Recently I came across Republic Wireless, which is similar solution and even cheaper than Project Fi.
I was wondering if there are any other companies that you might have had experience with, and how would you rate them ?
From what I have read, the transition in and usage of Sprint network hasn't been stellar. The T-Mobile part has been fine unless you aren't in an area where they aren't present. I think that this is why they tagged Sprint along to get a wider coverage.
I have TMobile and all the features you tried Namy, come from that service. International roaming (data, calling and texting), wifi calling. Sprint adds a little more umph but not much.
I'd go with Fi as well, but they don't have family plans. :(
Free unlimited international texting is a TMobile feature - that Google Fi is using. Free international roaming data and low cost calls around the world too. All TMobile. :)