We did the tour last year and I would definately recommend doing it even if you are just curious...there is NO hard sell!
We were looking at 220 points I think, which if we left a $1000 deposit, would cost £120 per month (over 5 years). The balance could have been financed with Abbey National. If we HAD of bought though, we would have bunged it on our 0% credit card and paid it off over the year.
We decided against at that time, because we had to buy a new car. DH also was interested in a Villa as well so we wanted to check out the options on that.
He did make the rather rash promise, that if the Dollar hit $2/£1, then
DVC would be worth buying into anyway....I have my pen ready for him to sign

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My DH is a keen statitician, and has spent some time doing the math. He worked out (for us) that it would begin to pay dividends in around 7-8 years (by, that he meant the cost of the holidays taken would cover the initial investment). With the Dollar so weak, he is definately coming round to the idea...and he is a hard man to convince!!