Bed delivered today. Feels firmer than one in store. Label on bed just says savant III. It does not indicate plush or firm. How can I be sure it is plush. Is there someplace else to look?

I purchased 2 iComfort Savant beds: a queen size for me and a twin for my mom in August 2012. The first few weeks were expected to be somewhat uncomfortable due to "break in period"; we both hung in; within a few weeks we were getting more comfy each night. About 8-9 months in she began complaining of hip and back pain in the morning; I had some too, but figured it was more her age and my health issues. It has continued to get worse. It has now reached the point of needing to buy a new mattress.
Sleeping with someone else is really bad - we both wake up achy and having to climb out of the ruts created during the night. Changing position while sleeping is tricky; we tend to roll back into the depression of the first position.
I actually purchased this bed at a local mattress store, not on-line, but feel that everyone contemplating this bed should be aware of just how expensive this mattress is $1,800 for a queen size bed ($1,200 for twin) that was only comfortable for 6-8 months. The warranty states 25 years...
"Serta warranty:
The warranty is honored if the mattress sages 1.5″.
Serta, like the rest of the leading Brands offers 25 years warranty and it is divided into 15 years non-prorated plus 10 prorated warranty which means you get full replacement for the first 15 years or full credit if the mattress was discontinued."
There is also a $50 inspection fee to have someone come check to see if THEY think it is a warranty issue. If it is, they refund the fee, otherwise it is just more money spent.
Customer service sent their warranty packet, you measure sages when there is NO PRESSURE on the mattress...since the issue is when you're on it this gives them the "out" of it being a warranty item.
ARRGGGG!