The Bible...(CRC) will always have relavence in my opinion and is such a classic that I would recommend for any Colorado boater to own it. Especially while it's available.
BUT, that being said, Kyles book is going to blow the doors off of it in almost every way. The photos alone will have it in more of a class of the "Coffee table" book along with ansel adams ish types... The the 600 pages of creeks and then follow up with a very contemporary lay out will have this easily winning any comparison with other guidebooks...
It's really that nice.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body. But rather...To skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming... WOW !!!! What a ride!!!!!!"