I completed a ride from John O'groats to Land's end in July 2010, over 16 days as a cyclo tourist rather than as a challenge cyclist, via Arran. I used this book as the main guide for selecting routes, backed-up with a GPS and found it perfect, even though I was doing the routes in reverse of what was desribed in the book. On its own, I think it could be tricky for navigating in some sections and some routes are quite hilly (the route profile helps but somehow seemed inconsistent and some parts came across as much more difficult than others). Really enjoyed the quick notes on the major towns and points of interest along the way. I would recommend this to anyone looking to cycle end to end if you're not pressed for time and if you're looking to amble along nice and quiet backroads, rather than trying to get there as fast as possible.