For me, even with the few problems that luckily didn't seem to affect me very much, VOIPo is the very best VOIP service I have had in the last almost 4 years.

The support response is awesome...imagine getting a phone call on the VOIP line telling me a change was made and a reboot might be necessary. Of course it wasn't necessary, or the call would have never reached me.
Easy to get spoiled with this level of service..