Too many people get het up about this topic. My review is exacly that - not a rant.
To clear things up - There are three editions of this book, the one I read was a 1998 updated edition which briefly outlines the ceasefire talks and The Good Friday proposals towards the end. These discussions were very much a work in progress when Coogan published. It should be borne in mind when reading a contemporary source that peace was on the table at the time of publishing and it would have been at the back of the authors mind when re-writing (just saying).
The bulk of this volume is a fascinating history of The IRA; their origins (Fenian brotherhood etc) and unlike a lot of sources does pay a lot of attention to The South (Rep of Ireland) and their involvement in the counter terrorism campaigns of WW2, The 50's/60's and 1969 onwards (And you thought it all began in '69) Tim Pat Coogan was very much at the forefront of reporting on these 'troubles' and has access to some very interesting people.
Unlike some of the reviews on here (sorry - couldn't resist) one thing Tim Pat does not do is get emotionally caught up in the rights and wrongs of 'the struggle' I thought I detected some bias towards the IRA at times BUT it is, as it says on the cover a history of The IRA not NI, not The Irish, The Union and not The Loyalists. You could do a lot worse than read this for an almost complete history of the IRA, I say almost as it is becoming slightly dated now and since it's publication there have been a few small splinter groups (e.g; CIRA, PIRA, RIRA) which disconcertingly enough is where it all began...
Please bear in mind the title - This is a comprehensive history of The IRA. And a fascinating and informative read it is too. To get a more hollistic perspective See also - 'Easter 1916' (By Coogan or Townshend) 'Bandit Country' by Toby Harnden and 'Big Boys Rules' by Mark Urban.
It's never one sided....