I won't bore you with my loquacious opinion on this magnificent book (other people have done that probably better than I can among these readers' reviews). No, I will simply tell you the truth.
When I finished reading the book in May 2003, I booked a flight to Verona and a hotel near l'Arena, and went to the stadium for the last game of that season (Bari, 1-1, for the statiticians among you). I had to see la Curva Sud for myself. Since then, having made friends with one or two members of I Piu Mati (ciao Christian, ciao Alberto, ciao Fabio!) I've been back several times (including a memorable 5-3 win over rivals Vicenza [di merda!]) and they've even been over to see my humble bunch of sleeping giants (the West Country's top team, Bristol City. Well, excluding Yeovil). In short, the book inspired me, it coursed through my veins and I was like a junkie, needing a fix of the Brigate Gialloblu (minus the violenza!). A terrific, vibrant, inspiring read. Forza Signor Tim!
(PS If you liked the social/cultural/non-football parts to the book, make sure you read his Italian Neighbours and Italian Education books. The description of which coffee to drink when in the former book is as good as the opening chapter of A Season With Verona)