I'm not sure why the other reviewer had problems with the Kindle edition. (Perhaps he purchased the PDF version from Lonely Planet instead of the Kindle edition from Amazon, which I agree, does not work well on a Kindle.) All the Kindle links, search, and other functions worked well on my Kindle keyboard. I originally borrowed the book version from the library and purchased the Kindle edition to avoid carrying a book on my trip. Besides not being able to see photos in color, I prefer the Kindle editions due to the search and bookmark functions.
In terms of content, this guide covered all the areas I traveled to (Dublin, Galway, Aran Islands, Cong, and Connemara) and was a great reference throughout the trip, as Lonely Planet guides have always been in my experience.