last mattress we had was a disaster...only 2 years old and we couldn't handle it anymore...we both sank on either side and had to climb a mountain if we rolled over to get next to each other...this has a 10 year warranty too and should have used it but ending up selling for half of what we paid to avoid going through all that...as senior citizens with aches and pains, we need support and a good nights rest..the new mattress is a king...select perfect sleeper...summerscape ll that was not listed in your listings of models so I selectd the Kleinmon ll