i think we are going to go with two umbrella strollers this next trip for our twins. What can you tell me about the connecter attachment? Do they work? We have a Combi Twin Savvy, but they are starting to go through the "No, no stroller" phase so I thought if they each have their own stroller at Disney that will make it exciting for them to be "alone" For the few occasions one of us is on a ride, etc. we will need an attachment to keep them together.