CoachellaOfficial is effective at telling you who is playing where and when, sort of...
The map doesn't list which venue is which, you have to tap on a pin that may or may not be right next to the venue (Yuma).
The Good:
It's great for sitting down in the morning, planning out your day, and having reminders buzz you when each artist is going on and telling you which stage they will be on.
The Bad:
CoachellaOfficial is less intuitive and featured than the printed brochure. It's difficult to say: "hey, I'm walking past this stage and I like what they are playing, who is it?" and find an answer.
A number of the lesser venues (do-lab, camping dome, etc) had no lineups listed said "schedule dates coming soon" for all of weekend one. The brochure had at least the Do-Lab lineup listed...
The Ugly:
CoachellaOfficial turns on your battery draining GPS and then doesn't make use of it unless you're in the map (which isn't very well done).
CoachellaOfficial should work in such a way that even if you're of an altered mental capacity you don't have too much trouble using it, other wise what good is it?
SUGGESTIONS:
Link with friends on social media and mark "meet-up points" on the map. Have venues clearly labeled on map (not as pin markers).
Have all lineups listed.
Don't have CoachellaOfficial glitch out and delete my whole schedule on Saturday night...