This is without a doubt THE best documentary on Hellraiser and it's first sequel, Hellbound:Hellraiser II. An extremely thorough and exhaustive collection of interviews with pretty much everybody involved in the creation of these two masterpieces on Horror cinema, the only real exceptions being Clive Barker himself (I believe due to illness) and Ashley Lawrence, who portrayed Kirtsy Cotton in the films, but due to the sheer amount of information and anecdotes from the large number of talking heads on offer here, their absence is barely noticeable. Spread out over 3 DVD's, with the first two dedicated to Hellraiser and Hellbound respectively, and the third disc being crammed with extra features, which include mini documentaries on Clive Barker, Channard, The Cenobites, the unused music of Coil and much more.
Fans of other excellent documentaries of this type, such as More Brains!:A Return to the Living Dead (from the same writer), Crystal Lake Memories:The Complete History of Friday the 13th and Never Sleep Again:The Elm Street Legacy will certainly enjoy this, I'm sure.
Highly recommended for fans of the Hellraiser franchise