I bought this book years ago, and found the information interesting and useful. But it's also a shill for their products. Annoyingly, I found the home jig for knives and chisels extremely fiddly. You have to adjust 4 separate set screws (allen screws) to install the jig (mount it on a knife or chisel), and you have to do it twice: once for the coarse stone and one for the fine stone. I eventually switched to EdgePro equipment for kitchen knives, and I use a Veritas system jig with an 'ordinary' diamond stone for chisels and plane blades in the shop.