Hi there,
I have the City Classic and absolutely love it. To be honest, I'd buy it for the one handed fold system alone.
I have used it around town shopping, on the school run and across the fields and its works well in every situation.
It is fairly heavy to lift into the boot, but no more heavy than other 3 wheelers and I certainly don't find it too heavy.
We have the car seat adapter and use it with a Graco Autobaby car seat. I find its fantastic as my dd (17 weeks) is right up high in front of me when I use it. We decided against buying the carrycot as she is never in it for longer than an hour at a time and is now able to go in the seat main seat when it is fully reclined. There is a soft pram (cocoon type thing) coming out shortly, its already available in the US but hasn't passed safety in the UK yet.
It is extremely light to push and very easy to manouvre with just one hand. It is also very stable as the childs weight is distributed over the rear wheels. Haven't used it with a toddler, but its supposed to be suitable up to the age of 5.
The sunshades on Baby Joggers are fantastic and come right down over the child which is great both in the sun and when they want to sleep.
My only criticism is that there is no clip to keep it closed when folded, although I don't find it a problem as I just adjust the handle to its lowest setting over the front wheel and this holds it nicely compact.
I used to have a MacLaren Techno xt and the Baby Jogger knocks spots off it.
By the way, I also have the City Mini which has all of the same benefits but is much lighter weight and more suitable for travelling on the bus.