I hunted there last year and found that there were bucks in almost all of the basins I checked. It was a challenging hike in about 5.5 miles and 3k+ in elevation to get to the area. Only saw a handful of other hunters and only one that was hunting the same area for more than a day.
One piece of advice I got that seemed spot on was not to give an area more than 2-3 days before moving on. If you are careful about how you move around (don't walk the tops of ridge lines, don't make a lot of noise, camp out of sight) you will see the bucks in an area within 2-3 days.
If you plan to camp I would recommend that you take some larger collapsible water containers - it is a pain to have to drop down 1000 feet to get water every other day. If you have 5-6 gallons of storage you can drop down once and pack once then hunt 4-5 days.
You will enjoy that hunt, it is one of the most incredible places I've ever hunted. The lack of motorized travel in much of it makes it something special.
Hope you have a great hunt.