We used the app at the parks today and I have to say I'm impressed with the accuracy so far. As others have mentioned, prior to this app I have never seen a centralized DLR character schedule with times. We would always have to rely on character handler CMs and their trusty paper schedules. But to see the exact times and frequency of the characters on this app (like the WDW app) was exciting. We tested it out today with the Main Street characters to get some of the Fab Five (plus Chip, Dale, and Daisy) in their Diamond Celebration outfits and the app was spot on. It said Chip and Dale would be there between 10:00 and 10:15 and sure enough they came out exactly at 10:00 and headed back at 10:15. The schedule held true to the other characters we searched for as well. It even lists roaming characters like Peter Pan, Mary Poppins, Bert, Alice, and the Mad Hatter. The spontaneity of characters was gone a long time ago. Might as well plan and make the best use of your precious time in the parks.
On a side note, the ride times for the few that we tracked were pretty accurate as well. A couple of things that would be nice to add to the app are what the current FP return times are, and menus for restaurants. But so far I think it's a pretty handy app.