The bottom line here is that if you have done business with a book for a long time, and they have treated you professionally, you probably have zero to worry about.
This statement is simply false. No matter how good the book has been in the past (professional, always paid, etc.), it can all end in a heartbeat. Ask anyone with Ace's Gold, NAB or Camelot. There is a lot more than "zero" to worry about when dealing with ANY book that has your $.