After hopping around the big 4S, talking to all the salespersons while comfortably lying down on their beds, wifey and I decided to put our hard earned money on dunlopillo duchess (king size). We think there is definitely a real difference in the 'top top' series of the 4Ses and our purchase, but going down to the 4 to 6k ones, we can't feel much benefits. The top series are way out of our budget, so going for the 2.6k duchess (with nice frame and 2 upgraded memory foam pillows ) was a no brainer. Had went king koil too... but nothing attracted us. And for Serta, we felt there was way too much disturbance because of the connected spring tech they use. So my 2cents for everyone. Go lie down! Dun paisey. Just lie until u are ready to hop to the next