I bought this as I was replacing my lost copy of Nealy's KAYAK and spotted Amazon doing one of its many 'buy this with this and save this much' offers. Upon getting it I was a bit disappointed to discover that it is in fact just a re-hashed version of the old book with not a great deal of difference. The pictures of the kayaks have been updated to look a bit more like plastic `play-boats' and the paddlers are now sporting trendy new helmets, but fundamentally there's very little difference.
There is a wee section on more up-to-date methods in there, but not really enough to justify a whole book.
All that aside, it's still one of the best Kayak manuals around, with all of Nealy's original wisdom still being highly relevant today, and the cartoon/graphic style in which the books presented being excellent at describing the intricacies of fluid dynamics/hydrology...etc.
If you've got Nealy's original KAYAK then I wouldn't bother if I were you. If you haven't and you're looking for an indispensable guide to help you understand everything from why you keep falling in at eddy-lines to how to run grade 5 (the rule of `spit' is brilliant!) then this is a must.
3 stars because of my disappointment.