We did this last March and LOVED it! Best money we spent - for about $7/person, we had a delicious ice cream treat - we thought the vanilla bean ice cream was fresh and flavorful! We must have hit it on a good day - there was a ton of chocolate in the sundae - chocolate lined cone, chocolate 100 YOM decorations, chocolate sauce, etc. My girls loved the gummy worms that came as part of theirs!
You also get the characters! The character interaction the day we went was fantastic! It was very slow that day, but they all came by at least 2-3 times! We had Farmer Mickey, Chip and Dale and Pluto. Mickey colored with my youngest and Chip and Dale were hysterical! You pay for any drinks you order, but my girls just want water with their ice cream - they gave us water in the Epcot souvenir kid cups!
All in all, it was a fantastic value for us, and a perfect memory as well.