Andy Abramson's test of the AT&T CallVantage service is working out well. He figures that the quality and reliability of the service will serve as a benchmark:
Candidly, I'm not surprised the service is this good. AT&T has too much to lose in putting out an inferior product. By putting out a product that is at basic mode already better than the competition which went first, AT&T has really fired a shot that will be heard around the telephony world.VoIP Watch (Andy Abramson): My CallVantage Service Is Working
My gut instinct is that features and cost will be what consumers actually care about, as long as certain service and quality levels are met.