C.T.
This is a very popular topic right now! :-)
When we were shopping for a double stroller, I stopped every Mom I saw with a double stroller and asked if I could touch it and feel it and asked them their thoughts on it. In general, the Gracos all got poor rratings from Moms who were actively using it.
We settled on a Combi. I LOVE IT! It folds over twice. Fits comfortably in the back of our Honda Pilot. Is easy to lift and load. It fits in most standard doorways and I've never had trouble with it when out and about. The baskets underneath have been adequate. The nice part was that is wasn't as expensive as some other models we were recommended to try.
My one concern was how the infant seat would fit. I did not want to purchase a "special" infant carrier. We used our Graco snug and ride with it by positioning one foot in the cup holder on the right (or outer side), resting the otherside across the lap strap and then purchasing an inexpensive clipping strap at a hardware store. This we laced through the strollers framing and across the top of the carrier. If you look at any of the other systems out there, they worked essentially the same way - primarily held down/in place with a strap. I felt confident that my little guy was safe and secure.
I would probably recommending doing the same thing - look at a few options/choices that you like, examine them in the stores, take your carrier (if available) with you to try in it and then ask every Mom you see with a double stroller! Most Moms were more than happy to talk about pros and cons.
Good Luck!
~C.