I've put my two penn'orth regarding the pro's and con's of such a guide book in a past topic here, so i will cease to burden you again. But all i will say is, it really is an outstanding piece of work, the time and effort overall that must have gone into 'not for the faint hearted's' creation i'm sure can not be overstated and comparing it to the likes of 'selected caves of england and ireland'(or whatever it's called) would be an insult to 'not for the faint hearted', i take my hat off to the author and co. I don't feel there's anything wrong with consciously aiming to have all these trips under your belt, for the means of course the experience and not just the end result of sitting proud, i doubt a person with such vain morals exists or could even accomplish such a feat, at least half a dozen(give or take) of the trips in that guidebook require something special, something else that not every human being possesses in order to succeed and regardless of what folk's motives are in my eyes anyone who as that collection of descents under there belt deserves more than just a pat on the back(and after all it isn't just a random selection of hard trips in the north, it's the definitive list of hardcore trips). Me, i don't own a copy yet, my regular caving partner does and we certainly use it for reference, the descriptions beat the pants off northern caves and you almost feel the guidebook was written in such a way that every feature is embraced in passing, but me i was aiming for and doing a majority of these trips before it was ever published...........All the best to those who's eyes have been opened to a whole new world due to this guidebook, but even more to those who would have done these trips regardless of it's existence.