I've owned these for about a month now...I must say, I am really impressed by these. They eliminate almost all vibrations in areas that I have struggled to correct. I have a fireplace insert that would rattle to no end. My "sweet spot" for my sub sounds best in a certain spot but it vibrated my fireplace so bad I would have to turn the sub down. Since these have been on, I can watch the opening of Edge of Tomorrow without hearing one vibration! Best $50 I've spent that really made a difference! Highly recommended!