i borrowed one from a friend in syd (who has twins) and i loved it. it is a bit heavy and big - ie for taking in and out of the car all the time (liek if you were using it every day for shopping etc - but for me I often just ahve one of them or use a pram and a sling for these little trips) - but it takes up to 25kg in each side, one can recline and the other sit up - ok area for shopping etc. It fits through supermarkets and standard doorways (not with a lot of room but i found it ok going in and out of cafes etc). i found it really nice to push and i like the idea of them being sde by side. it also has a little clear section at the top so you can look in and see what they are up to (ie if the toddler is poking the newborn LOL). The only thing i didnt love was that it is hard to hang a nappy bag on the handles bc it is wide (whereas i have a bugaboo and my nappy bag fits nicely over it) - you can get around this with a hook though i guess (or carry less and put it underneath).
My friend also has a double maclaren stroller which is fab too - but not for newborn, prob better when the littlest can sit up if you can wait that long.
I have looked into the MBs quite a bit and it isnt worth getting the 'elite' - the main thing you get is a nice lining - and you can buy nicer ones seperately for the MB urban. there are usually a few 2nd hand ones online in melb and syd (i cant find one here though so may have to convince DH i need a new one).