Kindle's iPhone app really only does 3 things, and it does those pretty well.
- Sync
- Highlight
- Annotate
- Offline access
They hit on fourof the most essential functions for people who are reading on a secondary, mobile device.
The iPhone Logos app does #1 but even though #2, #3, & #4 are integral to L4, these are missing in the iPhone app, which has had me flip over to the Kindle reader even to access books that I have in Logos. I feel like a traitor doing it, but just wanted to voice my vote that #2-4 on the above list be prioritized for the iPhone app.