When we joined in October, you could put 50% down if financing for one year, or 20% down if financing for 3,5,7 or 10 years. In certain circumstances, they would allow 10% down(I'm not sure what they are, though). We were required to put 20% down, did not use MB, but we do have excellent credit and financed for 10 years (with the intent of paying off sooner).
Sheri