It's amazing that such a simple thing can have such a major, and positive, impact on your sound. I use this at all my gigs and it makes a HUGE difference. Acoustic decoupling is the way to go to eliminate boomy, tone-sucking dropout when playing on floors that essentially become "passive radiators." The GRAMMA solves that. I even take it to gigs where we are playing on hard floors - can't beat it. There aren't many things that cost as little as this that will affect your sound in a better way!