Theres a long thread on this that can be summarized as follows:- Buy a MacLaren Techno XT with footmuff and a carrier of your preferred type.You won't regret it.
Don't leave it upright with child in it unless you are standing on it or holding it up!
Thanks guys good points - the MB swift looks pretty lightweight with decent air tyres so maybe this would be a better bet of these two and then use a rucksack carrier for tougher terrain... rather than getting a bigger wheeled model which may be a pain for general use? Will have a look at the McLaren though. Cheers.
We've got a Deuter, I wouldn't trust it, but it seems like I'm just being a paranoid parent.