I have a DD (20 months) and a DS (6 months). So far I have had an Obaby XI (similar to P&T) and a Graco Stadium Duo. I've hated them both.
The Graco is huge and very heavy, I can't lift it properly when it's folded and DS has started to kick DD in the back of her seat.
I dislike the Obaby as I can't recline either child in it at the moment and they both regularly sleep in the pram. Also, I've broken the one I've got 
I do a fair bit of walking, especially to the shops. Occasionally need to get on a bus or train but not too frequently. I don't drive but DH does. We've got a Toyota Lucida though so space isn't an issue. Both babies weigh almost the same as DD is very petite and DS is huge :) this rules out anything where he will get too squashed.
I like the look of the Nipper and the BJCM doublebut I'm not sure if I'll get them through the front door. This isn't too big of issue though as I currently have to unload them one by one so that I can lift the Graco over the front step.
We are going on a day out to the coast in Sunday and would really like to get a new double before then or we will have to take two singlesust had an overpayment refunded to us today which is why it's such short notice.
So, which should I go for? I'm open to all suggestions