Very happy with this adapter and the stroller it goes with. I have 5 week old twins so I needed a double stroller to with 2 car seat capability. I did not want a tandem stroller. The book for 2 stroller is excellent and high in quality. So far it fits through most doorways without the carseats. However, with both seats attached, some doorways it may not fit through. I don't let that bother me since it will be used outdoors and in public places where almost everyone will have double doors.
slightly bulkier when 2 car seats attached to the stroller