I bought the B and D sets which allow the quilter to make many different blocks that will measure 12" finished which is the size I most often use. The templates are accurate and the pieces line up exactly. The templates are fairly small but it you cut the exact strip width first and cut all those pieces at the same time and are making several blocks the same, it goes much more quickly. I also bought one of her books showing even more blocks so you could get a lot of quilting blocks out of her set and book.