oh those!
We've got one of those at work they're actually a triple motor, 2 suction motors and a brushroll motor. The main switch turns the suction motors and the brushroll switch, which the brushroll only runs when you hold down. makes it convenient for hard floor spaces too. They seem to work pretty well the airpath is very wide and there are quite a few rows of bristles which seem stiffer than the brushes on this bissell. Then you have the wand, the power through it isn't particularly great but it's nice to have.
I thought what you were talking about was a direct air unit with two motors.