I am looking to buy a premium cotton / innerspring mattress for use on a platform bed (already bought), king size. I was looking at Shifman Beau Reve from Bloomingdales, and bc of Duane rec's on Royal-Pedic, I will look at Royal-Pedic as well.

My q is whether is makes any sense to buy a very expensive mattress if I'm going to use it on a platform bed. Don't such mattresses require their matching boxspring to really get the benefits you're paying for? Our platform is not a hard wooden board, it has wooden slats that pre-tensioned up and bend down, so it may be not too much firmer than a boxspring.

Thanks in advance to Duane and any other responders.