While I've used a number of more general wildlife guides, both in the Northwest U.S., and in travels around the world, I've never used one focused solely on birding. Thus, my short review must be taken with a grain of salt. However, I am repeatedly amazed at how fast I find a bird that's suddenly come within view. Further, I've yet to come across a bird in Oregon that I haven't been able to find in this book. AND The book is small enough to lug along on short backpacking trips -- as long as you're not also lugging a load of novels that must be read while sitting alone, next to a Cascadian mountain lake, of course.