Went to the Islands of Adventure side. It was awesome! Best rides were the new Harry Potter ride and Spiderman.
Tickets for the event are the same price everywhere. I little more information upon purchase would be helpful. I booked for a very busy saturday and almost did not get to see the Harry Potter area because they where giving out tickets to get in because they needed to excercise crowd control in the area. At 1:00 I received a ticket to enter stamped 6:00 that evening. Then by 4:00 they no longer were handing out tickets which meant no entrance that day for anyone who didn't have a ticket. I was lucky to be in the right place at the right time because when a mass amount of people left the area they then openned up the park area for a small time to anyone who wanted to get in. I was lucky to enter about 2:30. Then gave my 6:00 ticket to a young man who didn't know this program either and was told the tickets were all gone for the day as I was leaving about 5:00.
Universal Studios was really fun. I loved the Island of Adventure with Harry Potter world. The other park wasn't that great, but it was alright. If anyone only has one day available, I would recommend the Island of Adventure. Much more to do there. But overall great experience.