I have overall been disappointed in the CS. If I could go back, I would purchase a side by side. My main complaint about it is the difficulty pushing when you use it as a double. I thought it would be so handy to have all the different positions in which you could put the seats, but it is really only practical for me to use the stroller with my older child in the front (lowest) seat and the younger one in the back (highest) seat b/c the older one wants to be able to climb in and out as needed, and when using with the infant seat it was most practical to have the baby up close and facing me. What this means is that the heaviest child is farthest away from the handle and it makes it extremely difficult to push. It would likely be better if for some reason you found it useful to have your baby way down low in the front.
There is also only one position to have the seats in which you can actualy recline both of them, and it is with both seats facing the handlebar, which is not the usual way I would want to use the stroller with an older child. This means that if I want to recline, I have to stop, take both kids out of the stroller, remove the seats and turn them around and then get everybody loaded up again.
Meh. It is just not very practical for how expensive it is. We have a side by side umbrella stroller and I love it 100X more (but, of course, it can't hold an infant seat), and have never had a problem fitting it through doors or aisles. If I could do it again I would get something like the Bumbleride Indie Double. Alas. I will be using the CS again when this LO is born for the first few months as my husband would freak if I tried to convince him to buy another stroller.