I am a retired lawyer in Florida. Therefore - although I don't know all the answers - at least I know the questions

. Many programs like this don't give you any interest in the property itself. Therefore - if the project were to fail - you'd wind up as an unsecured creditor (behind lots of people with more priority). If you want to follow some interesting litigation regarding a very high end project that is now belly up in chapter 11 - look up the Yellowstone Club. Moreover - the law that may govern your rights can vary a lot - from the laws of Delaware (where a company may be incorporated) - to the laws of Mexico (where the property is) - depending on the terms of the contract.
So - if the offering seems in any way attractive - it is best to spend a few dollars and hire a lawyer to review any documents before you sign them. Also an accountant to go over the financial statements.
Just my personal 2 cents. These things look like high class time shares - which basically aren't worth a bucket of warm spit under the best of circumstances. If you want to own a vacation home - buy one. If you don't want to buy one (my preference) - rent someone else's (whether it's a house - a condo - or a hotel room). Robyn