After I tormented my back the last 10 years, with foam mattresses of any price range (these were all hanging by a maximum of one year in the middle), I decided to buy this pocket spring mattress. Now that I've slept several weeks later, I can say the purchase was worth it. The mattress supports very good, my back pain in the lumbar region have disappeared. What's good for my back injury, unfortunately, does not apply to my shoulders. The shoulder area mattress for my taste might be a little more flexible, I sleep in a side position the arms at night. Why only 4 stars. However, I could this problem (previously tested foam pad, good for nothing !!) by a 4cm-thick viscoelastic pad fix and now have a bottom line still good price a top sleep surface. Just in case anyone wants to make comparisons: I weigh at 1.60 m 55 kg. My husband (1.80 m / almost 90 kg primarily side sleepers) has the same mattress and is 100% satisfied. Addendum: The mattresses are now in use for 15 months and still have no adverse effect.