I have taken a day for uni on two different trips. The first was when only the first HP section was open. Paying for entrance into the one park was almost worth the extra cost to us, but just almost. The second time, both side of HP were open, requiring the two park pass. While the HP stuff was amazing, the rest of the parks were so over crowded, so hot, so much trash everywhere, so many rude guests, so many cranky employees, I could go in and on, it was far from being worth it to take a day away from WDW. Not only were we out a significant amount of cash for a sub par experience, we were out a day at WDW.
Don't do it. If your kids really want the universal experience, plan another trip, stay there for the perks, and make it a several day deal. No chance once day will cover a portion of the two parks...just like at WDW.
Don't do it. If your kids really want the universal experience, plan another trip, stay there for the perks, and make it a several day deal. No chance once day will cover a portion of the two parks...just like at WDW.