Whether your a parent of multiples or two close in age, what's your favorite double stroller? and what features do you think are the most important to look for?

We bought the double snap n go frame for when they are little, and figured we'd wait until they outgrew it to make any major decisions on a more expensive double stroller.

So far I really like the City Mini Duo 2012, since it's compact but still a side by side. But I just saw a guy with twins in the Phil and Teds Vibe Double and it's pretty slick! I worry about one baby being so low to the ground though.