Nine Mile from Negril is a FUll day. My advice is always if you are a FAN, and I do mean a REAL fan, it is worth it , OR if you can enjoy just the travel around and sights themselves, I say go for it. Otherwise I say skip it. The "tour" itself is best described as a "non-tour" in my book. However, if you want to pay your respects to the man, and again, if you are a FAN, it will mean something to you and you can look over the canned fabrication of it all.
Also, I DO NOT think Bob would approve of what Nine Mile has become by a long shot.