I used this from birth for our twins as was the only model which fitted through our front door. But they never spent terribly long in it until about 3 mths anyway (and then only a few hours a day I suppose). It didn't look that comfortable, but they always slept well. I made is more of a nest with some blankets etc so was more comfy.
I also have a 3 wheeler Nipper twin buggy, which was amazing when they were little tiny, but now they never sleep in the buggy it isn't that great as the seats are too low slung for them to see out. but it is easier to push.