My only knowledge of and experience with this book is through this posting.  It was interesting for me to learn of this aspect of the slave trade, especially after learning that one of the key facilitators was a poor explorer who lucked into the opportunity.  I am rather intrigued by the controversy surrounding the book itself.  Almost to the point that I may have to read it myself.  
Do I feel this work warrants preservation?  Absolutely, I do.  It is important for individuals, especially the youth, to see and understand that your roots and/or your background do NOT dictate one's destiny.  Also, this is a view of the New World not often seen.  Many others have focused on the easy things.  While Benzoni's limited experiences and knowledge may have influenced this writing, it is still a great work and needs to be save.  This is a side of the world we all need to know.