I had been sleeping on a very uncomfortable futon, and couldn't afford to buy a new mattress, so I opted for this 3-inch Serta memory foam mattress topper, and it completely transformed my uncomfy, lumpy futon into a cozy, comfortable place to sleep!  I love it!  I had been waking up with aches all over before buying the topper, and had been waking up still feeling tired and not sleeping well.  Now, with the topper, I sleep so much better and feel much more rested!