First off, you mean reserve. Pre-order means the device is shipped to you and you actually payed for it. Reserve means that you will still need to physically go to the store and pick it up. Secondly, this has been said OVER AND OVER.
The app doesn't work better. It failed for me all day. I only recently had luck using Chrome. So happy that Apples cluster**** is over for me. At least until the 24th when it happens all over again as everyone attempts to set their phones up.