I haven't fully made up my mind about David Shrigley yet. I have read his book from cover to cover, however, and am a little bit worried about him.
If you're easily offended, avoid this book. Several of the images and words in the book are profane, if not downright sick.
I don't personally like his style, but I can see why he's getting popular. It's original work, and challenging, too.
From my perspective, however, 90% of the content of this book conforms to my increasingly-stongly-held view that 'original does not necessarily mean good'. A few of the pages do genuinely challenge you, and make you think a little about your place in society, and the limitations society puts on you. The rest of it is rubbish.
Best I can say is that it'd be an interesting coffee-table book, if Shrigley were not so clearly vehemently opposed to coffee tables and all they stand for. You would NOT want your grandparents dropping round to your house and leafing through this book!
Buy at your peril...