I'm new to iFly GPS, coming over from Avare. I love the customization and high level of functionality! I would recommend (2) additional instruments that could be added easily:
1) Count up timer
2) Zulu Time (I always have zulu/local time displayed on screen)
I would also give a +1 to integrated W & B. I have other apps that will do this for now, but it's handy having it "in app"
Doug