It’s absolutely amazing! 
1. This cover needs to sit open for like 3 days and in meanwhile shake it up a few times, then it will rise to its real thickness
2. It’s VERRRYYY cloud-like, almost surreal and when you press on it, it’s not stiff
3. If you directly put it on the hard mattress, it may not give you a desired ‘cloud’ effect, so I advise to buy two of these or have another pillow-top cover directly on the mattress. That’s what we did and it feels heavenly now! My husband and I fall asleep like bricks!