I bought AWOL's guide in loosleaf. Kept the next 6 days worth in a pint size freezer baggie in my pocket. Kept notes on it. The rest of the pages were in a bounce box. I didn't burn the pages, I saved them all. Five sections over four years, using four versions, all recombined and bound. I refer to it frequently.
I also had ALDHA's guide in PDF, and JR Tate's "Walking With The Ghost Whisperers" in Kindle as a historical reference. Both highly reccomended, and they don't weigh nothin'.
I also carried Guthook, and like it for all the reasons mentioned. Plus, if you really need to get off the trail, you can zoom out and see the whole region.
Sometimes, sitting on a ridge with a view, I really wished I had carried a map and compass. Just to get a better sense of place.
I'm doing the LT e2e this fall. I'll be carrying their guidebook, guthook, map and compass.
L Dog