I gate check ours. It is a blessing to have in the airport. If we dont have a tight connection, I use it like a luggage cart (strap my carry on bag in it). Plus it allows the kids to burn off some energy by walking (and hopefully they nap on the plane). If we have a tight connection, the kids go in it and we move much faster!
At security you do need to remove everything from it and fold it up. Same goes for gate checking (be sure to get a gate check ticket/stub before boarding, and be sure you have id on it somewhere). Fold it up when you leave it since not everyone knows how to. When you get off the plane, it will be right outside the door, still folded up (unless you get really lucky and they open it for you, but be sure to check that its locked in place). Sometimes you do have to wait for them to bring it up, so dont leave the gangway or tarmack until you have your stroller. Just stand to the side to let others walk by, and send the rest of the family inside the airport so it doesnt get congested.
alison