We just got back a couple weeks ago. I didn't use them, but I wouldn't recommend them. They look very uncomfortable (hard plastic) the sun shades don't really cover the kids and there's no way for them to nap comfortably. We had our 13 month old and 2.5 year old. We brought 2 Maclaren strollers that I got on Craig's LIst for around $50. They reclined, folded up really easily, had shoulder straps to carry them and small baskets underneath.
There's a lot of walking at Disney, whether you use their buses or drive, just to get to the stroller rental places. I'd hate to have to carry a small child and everything else until you get the stroller and on the way out at night. I know a lot of people use them, but I personally think they're a little more appropriate for kids who are a little older.
Good luck!