Unfortunately, the jury is out on this one! There are so many mixed reviews, it is often best to be safe than sorry when it comes to the design of a product like this! All women’s bodies are different -- some might need more or less pressure than others to express! Of course, no one is going to be satisfied with all nine settings. One mom might only need one or two. Others may need to try many to get it right, or to express more milk when engorged. Over time, quite a few companies have finessed there settings to give the pressure a more naturalistic feel of real nursing; or, with 2-phase technology that differentiates between let-down and expression.