From my interpretation, if you want better QoS, you pay the $10/month - so you get a less likely chance that your packets won't get dropped on network saturation.
Also they like to sell there own phone service saying it eventually connects to a phone line so it doesn't go over the internet but only there private manage IP network.
Slashdot Mirror
From their news release section:C -AC99-136A5C2EA420/0/VonageMar8.pdf
http://www.shaw.ca/NR/rdonlyres/A19222AC-750B-42C
From my interpretation, if you want better QoS, you pay the $10/month - so you get a less likely chance that your packets won't get dropped on network saturation.
Also they like to sell there own phone service saying it eventually connects to a phone line so it doesn't go over the internet but only there private manage IP network.