With a new belt, good bristles, and clean filters..
They actually do a very good job. They don't have as much suction as the bagged versions, but they have the same super-aggressive agitator. Because of a leaky switchover door for the tools, the tool suction is much worse than it should be. Like other Hoovers from that era, they come with a full set of Hoover cleaning tools, which I always appreciated. Give it a tune-up, and you'll be happy with its performance!
The friendly old man that vacuums the office I work at uses a commercial Hoover Empowerment. He takes good care of it, and keeps the HEPA filter clean. I used it once, and I was actually surprised by how well it cleaned.