i have put allie in the back, and abby in the front, it's THE MOST ideal... the back could work for an older child with shorter legs, but abby is all legs and there is a picutre of the small space the child in the back has to put their feed/legs. the front is ok for a leggy child IF they want to sit cross legged, w/ the leg bar up, the foot rest for the front seat is a little to high for her...
It pushes very easily, my 6 y/o was pushing around both girls (weights below) the house for a while the day we got it. I haven't used it at the malls or anything yet, maybe this weekend...