I originally received the wrong size but customer service was great and sent a replacement.  
I would not call this mattress plush...at all.  Soft.... Absolutely. But, not plush.  On a scale of one to 10, I would say 5.  If you are expecting to lay down onto a super plush, cloud-like mattress, this isn't it.  It is comfortable, but not what I expected.  I will be adding a topper of some sort to make it plusher.