It's much better than no helmet protection for crashes that involve head injury and potential for concussion. Probably any more expensive helmet is just marginal gains. Although I do use a somewhat expensive MIP's helmet. And likely my helmets in the future will also be such.
Since we don't really get to pick what kind of crashes we will have, it's better to wear a helmet and be ready. I don't think the cyclists I see with their helmets hanging on the handle bars will have time to put them on when they have a crash. Unless they plan their crashes carefully! <grin>