I asked this question earlier this week regarding Hastens mattresses, but it really does relate to all mattresses with pocketed springs. 

There have been a number of comments on this forum where people say individually pocketed springs are not good support for people with lower back problems.
I'm very interested to know the reason for this, please. Do the springs get out of alignment somehow?    Or???? 
I hope someone can shed some light on this!!

E in Laguna Beach