I own an MVCI week in Marbella. I've used the owner's discount code to great effect for additional stays in Marbella and Orlando, but only at other MVCI resorts. I've never got a discount at a hotel.

When I stay at the Marbela Beach Resort the people there leave me a nice welcome letter and a bottle of wine to recognise my Platinum status.

The only other "benefit" I can think of is the ability to earn additional MRW points for referrals to the MVCI sales people - not something I've ever done.