Personally - I find them too expensive and am becoming turned off. This summer, we decided to grab the itinerary for the Rocky Mountains trip and did it all plus more for a tiny fraction of the cost. And given there are no passport/language/cultural issues to deal with, we just couldn't justify spending so much.
We were next contemplating doing one of the European ones for next summer. But once again - I decided to look outside the box, and discovered for a fraction of the price, we can all go on 14-day cruise around Europe instead! So all food, accommodation, entertainment, etc included, still see lots of places and have a blast, and also have some "adult-only" time while the kids hang out in the kids club, but for so much cheaper than a 7-day
ABD trip.
I'm still contemplating China and Peru for ABD, but not sure yet...