I run the Altus Metrum TeleMega and love it. The software automatically changes pages for the relevant flight states, presenting the important information for each phase of flight. Really good traffic light page for waiting on the pad, good stats during flight and the callouts let you find where the bird is in the sky during flight.
I too have a but it is a PITA since it is only on Apple hardware and I don't own any. Android has been promised but I found out recently that there is no development for that platform planned
. I might fly it in a month if I can get a lend of a device off my daughter.