The cover pages are so thin it almost looks like a pamphlet !! I used to buy these ACK books way back in 2009 . Compared to those books, the quality of the book currently is so low and the price is double. When the price keeps going up in order to maintain the making costs, the quality has to be maintained too. But the quality keeps going down as the price rises. Not buying these ACK books again. I'd rather read the older ones that I have and from the library.