The volume needs to be normalized. There should be a way to show what you have listened to already. There is an annoying bug that randomly repeats a chapter and stops highlighting the verses that are currently being read. your progress and bookmarks should be able to be synced between iOS devices. I think you should have a higher quality home screen icon.
Besides these few comments this App is a great resource and I listen each day on my way to work.
Megadeth_VA about NIV - Read it/Hear it GoBible, v1.2.1