I wanted to follow up on this thread as it was helpful to me prior to booking...I just completed a stay at Unico 2087 in Cancun booked through Club 1, saved nearly $2k over list price.
I was worried this was all sketch - on paper we were showing as booked through a travel agent in Mexico City - but it was all real and legit, we got exactly what we paid for and just saved a lot of cash. I'm kind of amazed it all worked out, but will happily use it again!