First, my eyes aren't what they use to be, so I like the Large text.
Second, I like the side notes and cross references on each page.
Third, I like the 198 Appendixes.
Go to http://levendwater.org/companion ... and look around to get a feel for it,
or go to a Bible store and find one and look at it.
The Structures and Notes, Critical, Explanatory and Suggestive, and with 198 Appendixes is unlike any other Bible I've seen.
Go to E. W. Bullinger, From Wikipedia and read about the author. Look at this sample page below.
I guess the best way I could describe it, is to send you to learn about THE MASSORAH.
" ... The Massorah is called "A Fence to the Scriptures," because it locked all words and letters in their places.
It does not contain notes or comments as such, but facts and phenomena.
...
This Massorah is not contained in the margins of any one MS.
No MS. contains the whole, or even the same part.
It is spread over many MSS., and Dr. C. D. Ginsburg has been the first and only scholar who has set himself to collect and collate the whole, copying it from every available MS. in the libraries of many countries.
...
This is the first time that an edition of the A.V. has been given containing any of these treasures of the Massorah, that affect so seriously the understanding of the Text.
A vast number of the Massoretic notes concern only the orthography, and matters that pertain to the Concordance.
But many of those which affect the sense, or throw any additional light on the Sacred Text, are noted in the margin of The Companion Bible. ...
Readers of The Companion Bible are put in possession of information denied to former generations of translators, commentators, critics, and general Bible students.
... "
These are just a few excerpts from that link above, but they should give you a good idea of why I like this Bible.
It should be worth your time and money to check it out, because it has been a great help to me.