We have the BJ city mini double too and have found it fantastic. I'm yet to find somewhere it doesn't fit. I take it on the bus and ferry all the time. It folds unbelievably easily. It only weighs a couple of kilos more than my single stroller. Very easy to steer and feels very stable. It has really good sun shades so you don't have to pin up extra stuff etc. I got a little cocoon thing for the NB stage which made it a bit more snug. I could go in...The only drawback is the storage underneath which is hard to get to but I can live with that.