Ditto. I'm coming over from cloth diapers, but I'm suprised how much they hold. We use them as 'big boy pants' with a difference when he's at preschool, and doesn't like to stop playing to pee, so he doesn't have any awkwardness. (It works for us better than just using undies and having puddles - he hated that and it stressed him.) Anyway, he wore one on monday, it was dry (ish - hard to tell for me, but it must have been mostly as there wasn't any smell or squishyness), and so we put him in the car and drove to the beach. He napped, and peed, and it held it all.
Re: pull ups