We just returned from our Universal / Sea World trip a couple of weeks ago. We purchased All Day Dining Deal from the Visit Orlando website prior to the trip. Their price was a few dollars less than
UT.
We thought it was worth it. My husband and my kid were quite happy with what they could get with the deal. They had a quick breakfast, lunch, dinner and drink/snack in between. The park was open from 9 am to 7 pm that day. They probably wouldn't have snacked that much if we hadn't purchased the All Day Dining.
I didn't get the All Day Dining because I thought I wouldn't eat that much. I just purchased an individual entree as I got hungry.