How long will a value mattress like this last?

Durability is the honest trade-off, scoring 5.3. The continuous-coil core of heavy 13.75-gauge tempered steel resists sagging well, but the comfort layers are thin and at a softer density, and that comfort foam is where body impressions form first. With a modest amount of foam on top, expect the surface to soften over the years. It carries a 10-year warranty; best seen as a strong-value medium bed for the shorter-to-medium term.