This is an excellent trail, with one notable exception (more on that later). We did this trail in 3 days (trailhead->deadwood camp->wahtum lake->out), instead of the suggested 4-5 days. Definitely do-able in 3 days, but all the elevation gain is done on the first 2 days. Be ready to feel burned out. Didn't see a single person first 2 days, which was nice. Highlight of the trip was Indian Point (sidetrip).
The author seems to enjoy taking the path less traveled, which, often times, means taking the more difficult path. Most of the time, we didn't mind. But, the Nick Eaton trail that he suggests out of Herman Camp is pure torture (2400 ft elevation gain in about 1 mile). My god! We did it at the end of the first day. His itinerary calls for it at the beginning of the second day. Either way, just take the alternate path to Indian Point. You'll thank me later. We did not see anything exceptional on the Eaton trail and you will be busy catching your breath than have any time to appreciate the views.
Most of the sidetrips are well worth it, especially since you won't be carrying your pack. I like how the auther saves the best for last (all the waterfalls, bridges, creeks, etc.). Also, it's downhill, so you can really take everything in at a leisurely pace.
All in all, this was a very good trail. Lots to see. Uncrowded trails, except the Eagle Creek trail part at the end of the trip.