The ability to highlight, organize bookmarks by folder, and create your own inline notes is awesome. The app is also packed with features like verse analysis, which is usable if you purchase additional translations, commentaries, or dictionaries. The downside is this app only includes the KJV for free and requires you to pay for other translations. It also doesnt have some the online interaction components that some other apps have (e.g. allowing people to share input on verses). But still, for any serious and diligent Bible student, there is no better choice than Mantis.
Izikk about Mantis Bible Study