This mattress is as good as they described.  
I am a side sleeper, 6 ft tall and 225 lbs.  On my Sleep Number, I always woke up with a sore shoulder and back (their inflating technology is so unreliable that I could never keep the inflation and firmness right and it supports the body the same at all points because of its design).
Have had Casper Wave Hybrid for a month and both wife and I like it.  I wake with no stiffness or pain at all.  properly supports my spine at all points and maintains proper alignment.  Sleep very well.  Keeps me warm also, but since I live in Phoenix, waiting to see if the foam is too warm in the summer.
Hesitated because of the price, but very glad we purchased this mattress.
The dog enjoys it too, especially since I turn less often.