I have used
Champion Communications for about 5 months and it works great. They have the same common features plus carry a new product the Flashphone, a portable softphone. My home service is taxes incld. $26.45 unlimited US & Canada and my Flashphone is $9.95/mo. I have gotten my money worth out of both. They are worth checking out!! No dropped calls and customer support is outstanding!! I think all VoIP providers have pretty much had no choice, but to be compliant with 911.
http://www.voip-champ.com 