Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Major Design Flaws

This is a great concept for an innovative stroller. I love that my [...] old can fit in the same stroller with out dragging out the double stroller. However, after using this stroller for 3 months, I returned it. There are several design flaws that were driving me crazy. First off, the front footrest was horrible. It has a flip-up design that does not allow my son's legs to rest on anything when it was in the down position. The footrest had to either be up at all times or my child's feet would flop over because there is no room for them. In addition, the front seat is very shallow and my son needed to be belted at all times or he would slide right out. Also, the tray is very difficult to remove and the stroller didn't break-down with ease (it was stuck opened several occasions). So, therefore I returned it and found another brand (same style) with out any of the flaws.