I haven't done one. Always been concerned that number one, if the outfitter is picking the spot, you are not going to get his best locations. Those would naturally be given to clients paying full boat for guides, etc.
Secondly, I prefer hunting the later weeks of the season, so other Hunters would probably have been there before me. If you get dropped in an area that all the game has been pushed out of, or wasn't there to begin with, you are stuck. Could be a long week if the elk are not in the drainage you get dropped in.
I have often thought the ideal would be to find a spot on my own that I would like to hunt and then find someone to pack me in. Finding that spot from 1200 miles away is the hard part. And no way to know that you won't find another camp set up when you get there. Even then, elk are not always in the same places from one year to the next, or even one week to the next.
I know guys have had some good experiences with drop camps. So it sure can work. But simply being packed in does not guarantee the elk will be there. If they are, great, but lack of mobility can be its own problem.