I posted a similar 35% offer back in September. I believe it’s been since 2007 that I last saw a 40% discount.
Of course, the price of the mattresses went up about 10% back in May of last year, so this 40% isn’t as good as the one I used to buy my own W Hotels bed four years ago. I am still happy with my purchase (of a plush top with feather bed).
Expiration date on the offer is unknown, if you’re interested you may want to make the purchase now.