Do you order it yourself? I'd be keen try to it but don't think any of the makers I use have the books.
To ThinkDerm's question, I tried both Geneva and CEGO, and Geneva was much better in my opinion. I think Foo has made the right call here.
CEGO makes a solid shirt at a good price. But fit, construction and fabric selection are considerably better at Geneva. For similar fabrics, CEGO is only about $30 cheaper than Geneva so price isn't so much of an issue.