Am reading Compañero. Casteñeda's indulges in florid prose too much though. Here's a sample of his literary whipped cream:

Now Ernesto Che Guevara would experience his true political rite of passage during those troubled months when the futile attempt of a decent Guatemalan officer to improve the dreadful state of his fellow citizens shattered against the inescapable polarity of the Cold War and the intransigence of the banana companies.

What I found most interesting was that Che only became politically aware in his late twenties, after he finished university in Buenos Aires. Much of his outrage towards social injustice arose during his travels as described in The Motorcycle Diaries, but the criticisms were mostly ethical or moral in nature. They mostly went along the lines of "X is wrong, how can the government allow this?" instead of attempting to analyse the processes through which these injustices were perpetuated.