Packed with features, it includes commentaries, dictionaries, maps, devotions, 23 English bible translations, as well as Greek, Hebrew, and many other languages. Download as much or as little of it as you want.
The only possible "problem" is that the author hasn't yet succeeded in getting through the licensing issues for many of the more-popular translations. Nevertheless, I can only sing praises. It's GREAT!
Disclaimer: Other than being a happy user, I have no affiliation with any recommended products.
I'll second that...e-sword has been my e-bible of choice for the last two years. Fantastic, fast, and as near bug free a program as I've ever seen.