As far as comfort, I liked the topper as I have aches in my knees and back.  With the topper, I was comfortable and didn't need a pillow between my knees.  My husband, on the other hand, could not sleep as it was difficult for him to turn over and he always woke with a backache.  But the real reason we didn't like it was because it made our bed so high.  We put it on an older bed in our guest room.