I bought them out of curiosity more than anything, the vast majority of the information in them is basic covering how to use the tool to do various things like program a key, read immo data, prepare dealer key and what all these terms we use mean. There's some more advanced stuff in there about recovering Benz FBS3 data from other modules and what is held where, and a little about BMW and what to do if a ISTA-P downgrade goes wrong. The primary audience is people who have bought a Key tool plus without any prior experience of key learning in my opinion. If you know someone starting out it might be handy to chuck them a set as it will save you a lot of stupid questions!

I received my books today. I like it. Clear writing and photos.