My husband and I need a child trailer for our 9 month old. We want to get a two-seater so we can still use it if/when we have a second child. We've narrowed our choices to the Burley Bee and the Bell Co-Pilot model A. Does anyone have any input on the quality, ease-of-use, etc. of these models? I can't seem to find many useful product reviews, so any input is welcome!!