Next Sumner and d\'Amato book

[Dan Howard]

Despite all that, and having got over my first impressions of the book, I would recommend it, but only to those with a thorough grasp of the subject - worth having if only because it contains a good pictorial survey of much of the sculptural etc evidence.......

That was my impression also. Use it like Nicolle's Arms and Armour of the Crusading Era and ignore any subjective commentary.