Last Sept. I bought a sit-n-stand, just for our WDW trip. My DD was 17 months and DS (6 at the time.) Honestly, I'm very glad we had a spot for him to sit. He didn't use it that often, but it was well worth it in my opinion, when he did. The thing I liked most about it, was at night or during really crowded times, I would just make him get in, and then I could just concentrate on navigating the crowds and know that I "had" everything. I didn't have to worry about also trying to make sure he was making it through and staying with me. There was also one night that there was a nightmare of a line waiting for the buses, and he found a way to sleep in it, and it worked out fine. There really wasn't a difference as far as the buses were concerned, between the sit n stand and the full size single stroller that I would have brought for my DD anyways, so it worked out well for us, and I plan on bringing it on our trip this year as well. If it would have been only my DS (even at 5) I highly doubt that I would have brought a stroller, but since we were bringing one anyways this worked really well for us.