Hi,
We also have the bugaboo chameleon and I love it! Agree it's not great on public transport, if you are alone, but two people can manage it.
If I am on my own I can get it in and our of taxis no problems and have been on some of the New World buses with it.
We brought it for the following reasons,
1). Can be used as a pram when baby is really small, and then more as a pushchair when baby is bigger. My son is now eight months and sitting upright in his b'boo can see the whole world, something he loves! However when he wants to sleep we can put it right down and he can be lying down to sleep.
2). Can be used with the Maxi Cosi car seat which we use with the b'boo when travelling in taxis.
3). Is very comfortable for baby, and for us to use. The handle is adjustible which means it can be brought to a height suitable for my very tall husband! He has tried pushing other peoples pushchairs and ended up with a sore back!
4). Fantastic quality!
We brought ours of the babytrader.co.uk website, arrived in a week!