Barbarian's Curmudgeonly Rantings

Is anyone familiar with CREDO mobile (formerly 'Working Assets' wireless?) I received an advertisement from them this week. Normally I would have just tossed it with the junk mail, but I was curious and read the information. They claim to be a "progressive" phone company and make donations to causes that I do happen to support. The fact that I'd get a bit of savings over my current Verizon carrier for at least the first year is an enticement, but they're also being carried on Sprint network and I had a bad experience with them. (Of course since a lot of that had to do with their customer support, this might be less of an issue than it was previously.)

In short, I'm considering switching my wireless, but I'd like to hear from someone who's actually used them first. Anyone?