In addition to other positive reviews, I'd like to mention they are stackable. Other same size baking tins are not. And because I have two (because Delia's recipes require you to!) they are easy to store.
I really like this book because it gives you al sorts of ideas as to how to serialize your (printed) product. It doesn't give you a clear plan of attack when you actually want to executing it. It stresses more artsy and informal products.