I've heard troubling news using that method. Yes, they shipping what you order, but when the books/magazine arrive, you must be there or someone else will buy it first.
I don't know if it's true, since I'm using delivery service provided by my friend.
But if not, it's a very good idea using that delivery method. And if anybody in this forum want to buy Macross Ace and to ensure you will get it, I suggest try to contact nearest Kinokuniya.