New user since December 31st here in Gatineau/Ottawa and so far so good. No missed calls whatsoever. Pretty decent 3G speed (waiting for software upgrade from Android to have 4G). It covers the areas I most visit being Ottawa/Gatineau and Montreal. You roam onto Rogers network when out of coverage. The only downside is that you only get voice outside of Videotron's coverage but it should not bother me one bit except for the week I spend in Gaspésie every year/second year. I can live with that.
The price is hard to beat on the package I got.
Special holiday promotion of $39.95 a month (includes Network and 911 fees, taxes extra) with $0 Nexus S on a 3 year plan.
500 MB Data plan
100 minutes with Unlimited nights and weekends
Unlimited texts, emails and photos sent via email/text