The best there is, but watch out for wet feet
If you own a Deuter kid comfort 3, I would definitely recommend getting this. It provides great peace of mind, and is small and easy to bring along. Unlike the Kelty `rain and sun cover', this cover
provides good protection from rain and wind - we used it in a snowstorm (accidentally), and it works well. Unlike the other reviewer, I think that it goes on OK with the stand out. (We're using a Deuter kid comfort 3).
Our daughter didn't mind it being over her, although with it on she had great trouble moving her doll around. One issue is that it doesn't cover her feet and calves, so if you had to do a really cold and wet trip, you'd need something extra to keep your child's feet dry and warm.