Just saw this article in USA Today covering Destination Clubs. We've been members of Quintess for a few years now. (Actually we joined Dreamcatcher Resorts, which merged with Quintesss). We've been extremely happy with DCR/Quintess. The idea here is that for less than the cost of a decent second home you can have access to amazing homes around the world.
I love to be able to pop in on my brother in NYC or take the kids to Maui for October break and have a fantastic place to hang out while there. They don't yet have any place in Vietnam but it seems to be on the list of potential destinations.
Disclaimer: We're investors in DCR and Quintess.