ITA
DVC is a great timeshare program, although truly it does benefit Disney-goers the most. Couple clarifications - the current lease does end in 2042 (basically, they're 50 year contracts and they started in 1992 - so if you bought anytime after that, your contract still expires in 2042). However, the new Saratoga Springs resort will have new 50 year contracts starting from year of purchase. I was not aware of the new leases starting after 2042, although I do not doubt it. For some, they might find the perpetual ownership more attractive, but for us we'd be pretty old by the time 2042 rolls around so we were ok with it ending then... and also the benefits of it being Disney outweighed whatever benefits owning in perpetuity might bring. Also, the reservation process is very easy with DVC so we found that attractive as well.
DVC points are also good on the Disney Cruise Line as well as other properties (CA hotels too - Disneyland Hotel, Paradise Pier or Grand Californian) but like Nikechic said, the point cost is higher than at the Disney timeshare properties. However, it's still easy to book other hotels should you want to try something new. You get the biggest bang for your buck at one of the 6 timeshare properties. You can also reserve single nights at a selection of hotels in the country under the "Concierge Collection" which is nice since you don't have to commit a week's worth of points for those.
It's great because you can split up your points (it's not restricted to a week-period) and you can choose your start and end dates so it's great. I don't always want to go Sunday-Sunday or Wednesday-Wednesday like traditional timeshares run. The only time you're restricted to week-long periods is when you exchange out to Interval International for traditional timeshare exchanges.
It's also great because you are guaranteed the same point exchange rate for all future years (e.g., 126 points will get you a week in a studio at the Boardwalk Villas - and will ALWAYS get you a week at the Villas). The great thing about that is that you don't have to deal with the price of inflation (what cost you $2000 today will cost you $3000 next year, and so on) so you can guarantee yourself the same vacation year after year (generally speaking) because you will get your new batch of points each year to use.
We are using our points this year to get two 2-bedroom villas at the Boardwalk (11 more days!) so we are really excited about that.
It's really great - I highly recommend it.
Let us know if you have any more questions!