The service I have with Vonage is acceptable, but my major gripe is that they are switched in the US which means I cannot dial any Canada-only toll-free numbers.. This includes several government offices.
Vonage Canada customer service claims they are working on it.. But it's been a problem for 2+ years.
I've been setting up our construction trailers with Vonage now. What I like about it is I can get 2 phone lines for half the cost of comparable Bell service, and when the site closes down, I can pick the box up and move it to the head office, or to a new job site.
And if I recall correctly, Cogeco also offers the QoS charge.
Last I heard Vontage was going to the CRTC (Canada's version of the FCC) to have Shaw remove the QOS charge.