One of the Shark bagless uprights indeed did very well in Consumer Reports' tests, and is a recommended model: The Shark Rotator Professional Lift-Away NV501.
Here are the scores:
Carpet cleaning: very good
Bare floor cleaning: excellent
Airflow through the hose for tool use: good
Noise level: very good
Emissions control: excellent
Handling (pushing, pulling, carrying): very good
Pet hair removal: only fair
Here's a summary of their impressions -
CR's Take
Shark's 3-in-1 upright isn't without flaws, but it conveniently converts from an upright to a canister or hand vacuum with the touch of a button. The lightweight, 17-pound vac was impressive at cleaning carpets with little emissions, and its swiveling head allowed easy maneuvering. It also was fairly quiet. Minuses: Although we liked the tools, airflow was only so-so. In our pet-hair pickup test, most hair wound around the brush. And you don't get manual carpet pile-height adjustment, which is better than automatic systems at matching the brush to the surface.
Highs
• Excels at removing embedded dirt from carpets
• Performs well when cleaning bare floors, ideal for kitchens, bathrooms, and hardwood floors
• Excels at capturing all the dust it picks up, important if you have allergies
Lows
• The on/off switch is inconveniently placed
• Requires manually emptying the bin, which is messier and sometimes presents problems for those with allergies or other respiratory issues
• Lacks a manual carpet-height adjust
