If you do a lot of driving on dry pavement and/or highway, I would not recommend Q-rated tires. I have Q-rated, 14" tires and the car really does "feel" like it's swaying side-to-side. Having said that, though, they're fantastic in snow. But next time, I'm sticking to H- or at least T-rated tires for the winter.
My OEM summer tires are V-rated and a few summers ago, I made the mistake of getting T-rated Yokohamas (Avid T4). Big mistake. Brakinging sucked. Every time I stopped, my passengers would roll forward. Consumer Tires in Mississauga graciously offered to buy these tires back from me as I bought their Michelin Exalto's.