I had the original Spirit filled Life Bible so when I saw the new I had to get it and it now includes many different contributors to the notes from various denominations so more information but not at the cost of the Truth.
The NKJV stays just as poetic as the Authorized KJV yet is easier to read and understand. There are those scriptures in the Bible that are hard to understand and this Bible provides help in the form of Word Wealth which explains the meaning of the word via Strong's with even more information added. Also various other goldmines of information such as Truth-in-Action at the end of every book and Kingdom Dynamics throughout, footnotes, fully referenced, maps, charts, how to outreach section at the back... the list goes on!
Another notable feature is the fully in depth look at Revelation from various viewpoints, Pre-tribulation rapture view, Mid-tribulation view etc without just the one view it makes it accessible to all without bias.
All that information and yet it is not too heavy to pick up! Great Word, great book, great translation (in my humble opinion), loads of information but not so much that your head hurts and you can still carry it about!