A great rating with the BBB isn't the best indication of how trustworthy a business is. DO NOT GIVE ANY COMPANY MONEY UPFRONT TO "SELL" YOUR TIMESHARE!! They are not in the business of selling, they are in the business of promising results as they take your money. Results that do not happen, as they will tell you that any promised buyers mysteriously change their minds once they-timesharepartners.com- have your money.
Again, if they really, really can sell your timeshare, offer them $2000, not just $900. That's more than double their fee! They would just have to wait until they have actually sold it. Why wouldn't they do that?! It makes total sense...unless, of course, they DON'T HAVE A BUYER. So, if they don't have a buyer, what happens to your $900? *poof*-it's gone.