I'm reading this book right now.
I think it's a good book because Cunningham says in it that the way he does it isn't necessarily the way everyone should do it, and encourages people to make stuff up and see what works for different things.
Only problem is now I have to actually start making a herb collection so I can start experimenting.
I'll probably have to get his book on Herbs so I can try my hand at growing my own supplies.
The book has also inspired me to build a still so I can try making essential oils.