We went with 3 little kids (ages 6, 4, and 3) and this was fantastic. They wanted to see characters and it told us when and where each character currently was and where and when to find other characters in both parks. We could search by location or by the characters they wanted to see so that they got to see the ones they cared most about.
In adition to wait times, it also let me tell in real-time if a ride closed so that we did not waste time going or deciding whether to wait. It also worked great when the ride reopened because we could instantly see it and see wehter there was a wait time.
Swut about Wait Times for Disneyland, v3.5