A bit of warning: I bought the iBooks enhanced edition of the Index Xenos 2, thinking it'd be pretty-much a straight digital implementation of the physical book, but with maybe a couple of 360-degree model photos or somesuch. Unfortunately, GW went all-in on the capabilities of the medium, and instead of presenting each unit's weapons & capabilities as simple stat-blocks (like they did in the physical book) they put all the crunchy bits in as cascading hot links -- so instead of just glancing at a unit's page for specific details during play, you have to click through one or more links. Super aggravating.