Provides moderate support, ready to install, quick delivery. but is not as sturdy as an alternative that I've purchased. Also the board is not wide/deep enough to fill the sofa bed... you will need to purchase TwoIt’s okOur loveseat, which we can't afford to replace right now, springs were too worn. This cushion is perfect size, the loveseat is like new again! It arrived exactly when I was told, packed perfectly, & worth every penny.I expected more firmness.Installed in a second. Fit nicely, deeper than others so more stable.The size was longer and narrower than my couch which has normal dimensions. Sent backHelps slightly but not much. It’s not worth the price. I had to get two so it’s pricey for what it doesn’t doI wish it covered the sofa from the front to the back it’s three inches to short so you have to decided if you want it closer to front or the back of sofaBrought 2 of these and they are absolutely useless. A total waste of money that give no support what so ever. Save your money and buy a piece of MDF instead.Boards are sturdy enough and gave my sagging sofa a new lease of life, but the surface of the boards are too shiny and the cushions slip so I have to get up every 10 minutes or so to push them back or they... and me... would end up on the floor.Waste of money. Doesn't make the slightest difference. The slats are flexible and weak. In fact, the only difference is now the cushions slide off constantly as well as sag.The principle is simple, however the size and particularly the depth of the product is the issue. It seems it comes in many different lengths, but only one depth. Having measured my sofas and now friends sofas, these boards are not deep enough OR another size needs to be made. I would suggest 23cm.As a result, this product is mostly ineffectual.I ordered the 66cm got the 44 cm just about worked . I do wonder if the proper size would have worked better . but it's fine