I first got this stool mostly on a whim.  I love horseback riding, and it appealed to me to sort of work in the saddle.  But before buying I did a little research on this kind of stool, and the benefits for lower back problems are amazing. It alleviates the pressure on my legs and has helped strengthen my lower back and core.  There is no slumping on this thing.  It takes a little bit of build up time (you won't be sitting in it for a full 8 hour day right out of the box), but well worth it.