Actually felt a difference in my couches. Glad I made the purchase.

Works ok but it sticks out under the cushion maybe most secure inside the cushion would be nice. ! Otherwise it works well.

Not as Advertised! Send flimsy no support whatsoever. Planning to return a true waste of my money. I needed a thick cushion. This is not it.

Very comfortable and works very well as a replacement cushion. I highly recommend this product.

yes, they do make the sofa seat more firm, which was the reason for the purchase. One thing though... There is now a gap between the cushion and the sofa. I'm hopeful that after a bit of use, the gap will go away.