We may know the outcome, and it may not have been intention, but this almost reads in the fashion of a fictional action novel. Guevera's distinct analytical style however shines through, and if the reader was somehow unaware it wouldnt take long to realise they were reading history.
This is a fairly short diary that spans just over a year from the boarding of the Granma in Mexico to the final victory battle, reading to and from work and for an hour or so a night it took me a couple of days. As you would expect the diary more or less runs in chronological order, with the author adding detail retrospectively where deemed necessary, we witness all the battles he participated in and "those" moments in between that are so critical in any war. Context is usually pretty good, giving the reader enough information of the tactical relevance of each march or battle, and there is a lot of marching. As Che writes himself, a two hour battle can be retold in 3 minutes, but what comes out so expertly in this writing is the emotional toll of all aspects of their journey, from the killing to the toothaches, the despair and betrayal, to the jubilation, told first hand it gives an extra dimension to the stories you may already know.
As with Guerilla Warfare, this is an essential read for anybody wanting to truly understand Guevara's ideology and mentality, it comes though in his speech and thought, which hard as they may try is normally very difficult for a third party to portray without the actual individuals explanation (I'm not slurring biographies in this statement). Considering the length, I would also recommend this even if you are merely studying Guevara for a short essay or to get a high level overview of the man, it is not steeped in ideological or political theory so isn't particularly difficult get through, whilst being exciting enough to stop you from putting it down.