As long as you buy direct from DVC, you can use your points to book WDW/DL,
DCL, RCI--all resorts,
ABD, and Concierge Collection(usually high end hotels). If you buy resale, you are limited to using your points on WDW/DL and some RCI.
Below is the link to the 2015 ABD Points Chart(I hope it works):
http://advc.disney.go.com/media/dvc...charts/2015/adventuresbydisney/2015abd618.pdf
The points are based on double occupancy and I have to pay the 40% single supplement for ABD when I travel and the almost 100% DCL single supplement when I cruise--it used to be about 40% and I'm really bummed that it went up. As you can see, some of the trips require a lot of points, so if you're planning on getting a 160 point contract you probably would need to pay OOP because you won't have enough points even if you used three years worth of points which you can do(I started out with 160 points and soon realized that was not enough for what I wanted to do once I saw the ABD
point charts--it's a lot less points to take the cruises). On each of the ABD trips I've been on, there were usually a couple of DVC members.
The Med Cruise Add-on was the first ABD I did in 2011. I loved it and was hooked from that point on. It was also my first Med Cruise. I liked that I saw more than I could have seen on my own and later realized that the ABD combined about 2-3 excursions a day. What I didn't realize was that I could not see the Med in one cruise. I will be going back for the third time this summer to finally see the rest of the things I still haven't seen. My second DCL Med Cruise, which was 12 nights, I didn't do ABD because the first seven days was the same thing I had done before. I just did the DCL excursions and let me say, there is a big difference in what goes on with ABD vs a regular excursion. ABD has a content expert on the tour, DCL has a third party person who takes you to the site but has limited knowledge of the site.
Unfortunately, I haven't done any trip reports because everyone else has done them. If you choose to do the Med Cruise, you should be able to see Monte Carlo, Rome and Venice. We literally did Rome in a day with the ABD add-on(didn't see David--Academia closed on Monday which was when we were in Rome and Pantheon--saw everything else). I loved Monte Carlo and we had lunch overlooking the ocean at the Fairmont Monte Carlo and had time to shop or go in the Casino. The bus also took us on part of the Grand Prix and we saw the markings on the road where the cars line up.
When I purchased DVC, I did so to go everywhere Disney went--not just to go to WDW. Right now, that's six continents and I'm happily vacationing my way through all of them. Good luck in your decision.