Customers report significant comfort and improved sleep quality with this mattress topper, often noting it transforms an uncomfortable mattress into a more supportive and restful surface. Many find it to be a great value, extending the life of their existing mattress. The quality and thickness are frequently praised, with the 4-inch depth providing substantial cushioning. While most reviews indicate no initial odor, a few customers experienced a chemical smell that typically dissipated within a day or two.