Customers say these pillows offer excellent customizable support with their adjustable filling system. Many reviews mention the ability to add or remove stuffing to achieve their preferred firmness level. The pillows feature two distinct sides, with users noting the cooling properties of one side. Common feedback includes appreciation for the firm yet comfortable support, particularly beneficial for side sleepers. While most find them fluff up quickly after unpacking, some mention a temporary initial odor that dissipates. Reviews frequently highlight how well these pillows maintain their shape over time, unlike others that flatten quickly. Many users appreciate the inclusion of extra filling for customization, and several note the substantial weight and quality of the outer cover.