Fongo has worked well in my case, and consistently so. The only real problem I'm facing, that I can't seem to resolve, is a minor one that affects texting. Sometimes, when I click on a text message conversation, it simply does not open. I have to wait 2-3 seconds, and/or click on it multiple times, and/or exit the app and open it again, before the conversation will open. It only happens once in a while, and when it does, it only ends up being a minor annoyance.
That said, I do think Fongo doesn't do the best that it can to consolidate its different brands and apps into one single user experience. For the sake of maximizing revenue, they're artificially fragmenting customers into World Edition, Freephoneline, Home Phone, etc. I think users would have a much better experience if everything was merged into one single UX.
I do not have any other complaints against Fongo at this time. Those who have faced voice quality issues with Fongo in the past have very likely not explored the configuration options in the app to its fullest extent, IMHO. I have a feeling that @srlawren may have something to say to that, though.
