Before I buy a manual it has to be something I can't find on line. Then it has to be something I need for repairs. I also look for a CD first seeing they cost less money then a book. I don't just buy books to have them. Another good place to find information, books, or manuals is the library. One of my big problems it seems like I never come across the same model, brand, type of equipment, or year twice and everything is different. If you want something just to have it maybe something that is generic that covers general repairs.