OK, ordinarily I'd let this all go, but I've used Credo (was Working Assets, which I liked **much** better as a name) for years ... about 10 years for long distance and a couple of years for wireless.
I'm extremely satisfied ... the service has been superior. At times when things went south (I have teenage kids, so you know what can happen with wireless errors) they've been sane, accomodating and helpful. The extra cost, if any, is marginal ... I compared to Sprint, and there wasn't any significant difference for me.
And the ability to hound what passes for a congress nowdays has been spectacular.
My view is ... if you have a problem with them they'll fix it if you approach them reasonably. More than I can say for the other carriers I dropped one by one to move all our phones to Credo.