OK - Vida Dollars are basically worthless, so do not fall for that option. What they told about these you is very unlikely to happen.
You did not say just what you are buying, but my guess is that it is a Grand Mayan or Grand Bliss 2-bedroom for the cost of MF based on what I pay for a 2-bedroom GL. I know that there are several Park units and assume the MF at those are similar to new GM or GB units.
The no pay unless you go is nice to have. But, you do need to factor in what you pay upfront. Also know that "trade-ins" often do not occur and you will have to pay a company to get rid of your current timeshare with no guarantees that it will sell.
I have been a Vidanta owner for 20 years now and we love the resorts. We have had the no pay unless you go since 2007. In 2013, we consolidated all 6 of our weeks to 2 two-bedroom GL weeks. It made sense for us as we had quite at few cheap resale weeks and some super-special contract options that carried over to the upgrade. We are happy with what we have! It depends on how much you are willing to pay. It will be a lot.
If you do decide to buy, spend time totally reading and making notes as to what you thought you were getting and what is in the contract. We both did this and found different things that we understood would be there. We went back the next day and talked to the VLO in Member Services (person who you actually signed all the papers with). They made an Addendum to ours to cover our concerns. Do this BEFORE you leave the resort. You can rescind with no issues at this point.