Sennheiser made these for the pro market. Whilst only time will tell I would make a calculated guess based on Sennheiser's design history that the 490's are exceptionally well built.Not a fan of all the different layers of thin-looking plastics held together by screws. I love the simplicity of the HD580 design that's followed through the HD600 to HD660S2. Just a baffle with the pads clipping on one side and the driver and grille on the other. All thick durable plastic.