I did a Harry Potter one about 2 years ago and it was well worth it. Same concept as DAH - unlimited non-alcoholic drinks, ice cream and treats (including butterbeer), dinner was included as well, and best of all low crowds. You could get into either Universal park a few hours before the event started to enjoy the other attractions, but event itself was across both HP lands with the ability to ride HE in between and I think one of the plusses over Disney is that because it was so spread out no one area felt crowded at all. (I’ve heard the complaints about Disney after hours events getting more and more crowded every year). My sister went on Dragon Challenge 6 times in a row with no wait, we got to do the Ollivander’s experience completely alone, drank enough free Butterbeer to horrify your average dietician, and had plenty of time to explore every single nook and cranny of both lands. LOVED LOVED LOVED it and super bummed I’m missing this year’s!