I purchased a mattress less than 2 months ago and it has a horrible sag in the middle. They claim that the bed frame is the problem and now want to sell me one and then resubmit the claim. (No guarantee that they will stand behind the new claim).
Tip for consumers: DON'T shop at Steinhafels
Products used: Have the same poor quality mattress. Considering going to Berlin where they honor a warranty