The piece of your espresso machine that takes the most abuse is your group and in particular the group head. The grouphead needs cleaning regularly, and backflushes aren't the only thing that will help increase the longevity of your espresso machine. The angled group brush allows you to reach every part of your group head, even those difficult to reach spots like the shower screen and gasket. For such an inexpensive item, why not buy for the longevity of your machine!