This is a MASSIVE venue! We went as part of Minecon 2013, and were over in the western concourse. The facility is clean, modern and well designed for heavy traffic. The space was great and was easily decorable, as well.
There are food vendors on site, although they are spendy. If you have the option and wish to save money, I'd suggest bringing your own food. The food served isn't bad, but they also know that they are serving a captive audience and so it's not the best food I've ever had.
The staff (security, food booth, janitorial personnel) were friendly and ever present. It helped make us feel safe! They also seemed accommodating to the event staff, as well. The janitorial staff handled the large amount of people well. Clean floors, clean bathrooms, stocked toilet paper, etc.
There is a giant circle drive out front which was very accommodating to large traffic, as well. At one point, there were probably 10 or 11 full size busses out there shuttling 7500 people back and forth from Universal Studios, and it was easily managed.
One big complaint I have about the complex is the parking. If you aren't on the very western tip of the western concourse, you've got a good 15-20 minute walk to your car. Not so excellent after a long day of walking when your feet are already tired.
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