Its just about the most readable manual Ive ever come across. In any subject. So often books contain the information you need but your brain atrophies while trying to understand it. Well, thats my excuse. Only caveat I would make. Its so heavy that you need to be careful the spine doesn`t collapse. (The books spine, not the readers) The copy I read was almost in two, but it was a library copy. On that point, anyone in the UK can ask their local library to get them a copy from libraries outside their borough. Tell them the City of London library has a copy. Just be careful of the spine.