You will have a harder time finding a campsite than you will finding elk in that unit.
You won't lack for company! Nor will there be a lack of non-resident hunters.
Watch out for the private stuff, the locals get a little testy in that country about trespassing.
In all seriousness, the country has a tremendous amount of elk and there are some good ones there. Enjoy it this year as the Idaho F&G has added a bunch of extra bull rifle tags and cow rifle tags. I think they are trying to thin the herd a little bit, it may impact 2006.
Also, you aren't going to get much rutting action early. The later in Sept. the better. I don' think there is a "bad" part of the unit, elk are all over.
Good luck.