Just off the 12 night Mediterranean cruise and this was our first ABD so I can't speak to the difference between ABD and regular excursions. What I do know is we LOVED the ABD experience on this cruise! Only 44 ppl can do the ABD add-on and it sold out the day it opened. I loved the ease of doing a Europe vacation and not having to really plan anything! They take care of EVERYTHING! As others have said you do things that others don't get to do and you are priority for pretty much everything. For example, ABD set up lunches in each port specific to the country we were in and it was amazing! In Mykonos we went to a lady's house that cooked lunch for us, OMG! There isn't an excursion you can get that does that. Its also really nice walking around the ship "knowing" several other families. Lots of people to chat with or go to entertainment with, everyone sits in the same area for dinner and with other ABD families so you really get to know each other. The ABD guides are second to none! Snacks and water all the time, keeping up with our stuff, etc. No other excursion will do that for you. (Thanks James and Robyn!)