How long does a density high last?

My skin elasticity had dropped drastically, so I was looking into radio frequency lifting, but I gave up on Thermage completely after seeing the price. Instead, I am extremely interested in Density-High, which is emerging as the best value-for-money device these days. I was really intrigued because I heard it is relatively less painful and produces similar results.

However, I am really curious about the exact duration of Density-High and how long this firmness actually lasts after the procedure. Since I am spending a lot of money on this, I feel like it shouldn't feel like a waste unless it lasts at least a year. I am worried that it might sag again within a year. Please share some real stories about the longevity from those who have actually received Density-High!