Has anyone seen the effects of Density High?

I've heard a lot of people are using procedures called "Density High" these days, and I'm curious if the Density effect is truly noticeable. I've heard from people around me that it can improve lifting and elasticity, but it seems to vary greatly from person to person. I'd like to know what it feels like for people who've actually tried it, and whether the Density effect is immediate or gradually apparent over time. I'm very interested because I'm concerned about sagging skin!