Baby Jogger City Select Stroller

I was at the park this evening for my girls' cheerleading practice and a mom walked by with a Baby jogger city select stroller.  A friend of mine had made the comment that she wished she'd had one of those when her twins were smaller.  I didn't know what kind of stroller she was talking about so I looked it up (with four kids, you'd think I would've known). 

A Baby Jogger City Select stroller can be reconfigured so you can add things to it.  Have one child and it works for one, add a bassinet when you have a newborn, add a second seat when the baby is ready to sit up.  How cool is that?