My experience
I missed out on the actual release day......
I have been back to the local mall Apple store 4 times based on employees time suggestions.
1st day there was a line of about 75 for only 20 ipads (all wifi only) at 9 am
2nd day was there at 8 am (their suggestion) 30 in line, only 10 received.
3rd day (yesterday) was there at 8 am, 45th in line for 30 units. On the phone yesterday afternoon was told I should be in line at 7 am, for a big shipment that had already been received, but they were instructed to not sell until the next morning.
Today (The next morning) I was there at 6:45 am, was 19th. in line, when they let us enter the mall, the staff took 3 people that were in line that they recognized & let them enter the store immediately. The rest of us were told that they had received 11 units and all were low end wifi only. Big shipment!
The woman in front of me has two friends who practically live at the Apple store, and she commented that the staff "held" multiple units for them, and they picked them up on Tuesday!
I sure wish that they had done the pre-order procedure...... I didn't order right away on line because of all the hype saying that with all of the retailers there would be plenty available........ almost all of the retailers in my area had "0" on the opening tnight.