I did prefer to have my twins side-by-side. I never liked having one behind the other. It's like letting one see things first and having one hidden. I think this is a good quality stroller with a name you can trust, BUT I do not feel it is fair to the babies to be pushed with one behind the other.
With the DuoGlider it is very easy to set up pull the kids and carseats out of the car as one unit, lock then into the stroller and go on you way. It is a nice sidewalk /store stroller, but with the small narrow wheels it is tough going on soft grass and sandy surfaces. The height of the handle is comfortable for my 6 foot frame unlike some other strollers that had me bending over to push. Now that the kids are older and now sit in the seats, We still have no problems using this as our street walker. The down fall is that it is a large stroller and does take up room in the van. For trips on the plane we use two umbrella strollers. They are a stopgap measure for that. Our next stroller is a B.O.B Dulie for off road use and jogging. The Graco is nice for infants and kids up to aboout 18 months. After that the problem that we are starting to experance is the child in back kicking or pulling the hair of the kid in front.