You really have to evaluate it for yourself. If you plan on staying at
DVC resorts a lot, then, Yes, it is worth it. If you plan on trading out a lot, then you have to look at what value you are getting.
You get the best bang for your buck staying at DVC resorts. Probably the next good value is the Cruises, and even all the other "trades" are good, just not as much value as the DVC resorts.
There are several reasons we purchased:
1. We LOVE WDW.....my parents live an hour and a half from there, so we have even more incentive to go down and visit them now.
2. We are spoiled by Villa style resorts....having a 5 YO and 3 YO, we want to have our own bedroom, a TV with DVD player, a FULL kitchen, etc.
3. We didn't want to be locked into a single resort, a particular time of year, etc that comes with many other TimeShare type purchases. Actually, I was totally against time shares until I talked to a couple of co-workers about DVC.
4. I like the point system. Very easy to understand and use.
5. We LOVE WDW....oh, did I say that already????
6. Once the kids get older, I want to be able to to other vacations. DVC is very flexible that way....of course, many of the things we want to do in the future use more points, and we will probably add on more in the future to cover those.
We just went on a 7 night Eastern Caribbean cruise using points and LOVED it....even more than WDW in some ways.
Here is a thread where I did my math....
Doing the Math - The Real Cost/Savings