I have been leaning more towards a roof rack because I dont have a hitch on my car, and I'm not a huge fan of trunk racks. I would prefer to use my trunk without having to take the bikes off. And like Velo said, I'm sure I will end up buying some of the other accesories that Yakima makes for it for other uses.
However, I suppose I could buy a used one and just buy new Q towers made for my car?