As someone who sold matresses for about 8 yrs, I would say no. Then again, if you spending some major cash, say 900 and up, you'll get good quality no matter what.
I tried them all in the store (all the Simmons and all the Sealy) and picked the one that felt best to me. It was the next to most expensive of the beauty rest mattress. I think the warranty was similar on both (don't remember as I wanted what I slept on at the Dolphin!).
Go to the store and try them out.