I have the XL480, switch is on the base unit, I think on newer versions the switch may be on or near the handle.
I use it for agitation. Got mine off Mike Haliday and he used the stiff orange brush but bent the bristles over to lay flatish. Does a good job and useful for stairs (risers as well) and the smaller areas/rooms.
As an agitator I think the Envirodri/Host/Flexi5 etc are better, but Oreck does a god job.
Get the accessories from Solutions Cornwall and others.