I have used Book2 Park in the past, and find this to be a very useful service. I generally park at the Embassy Suites when I fly out of Reagan, despite the fact that it has become more expensive to do so. It is most convenient, coming from MD, and I feel that my car is fairly safe there. It would be helpful to be informed ahead of time instructions to push button to call, in order to have the gate lifted when you go to park, as would also be helpful in order to leave the lot as well.