The brush roll WILL NOT turn off. If that attachment is connected, it's spinning. It has two types of bristles on the same head. The carbon fiber set is supposed to reduce static on hard surfaces and act as a better "sweeper", but in my experience that head only pushes around large particles on hard surfaces anyways, so it's not very good.
Edit: it works acceptably on carpets considering it's a cordless vacuum, but still nowhere near as well as a corded vacuum.
Thanks - that's the impression I got but it kept acting like it was good for wood floors.
BS - any decent hardwood floor installation will warn you right off the bat not to use a roller brush on them.
Too bad, keeping my $15 wonder from wal-mart. That damn thing keeps on going and going. Cord is only negative.