Ever heard of "Diamond Mattress"?

We’re bed shopping and the best one we’ve found so far is by a company called “Diamond Mattress” from southern California.

I’ve never heard of this company (despite the fact that they say they’ve been making mattresses since 1947).

Has anyone bought a Diamond Mattress? What’s your opinion of it? Good? Bad? Indifferent?
Thanks,
J.

(My one bump…)
Anyone??? Bueller?

J.