It is possible to find which lightweight vacuum has the best reviews by browsing reviews from Good Housekeeping. There are also reviews available at Trusted Reviews and The Independent, the latter of which contains a range of good vacuums, including lightweight options.
The Oreck Magnesium RS is the lightweight vacuum with the best reviews, according to Good Housekeeping. It boasts superb dirt-removing powers, claiming to pick up 92 percent of all dirt, including pet hair. It can also maneuver under couches and other small spaces for efficiency. Unlike the Oreck Magnesium, the Shark Rotator Lift-Away has plenty of attachments to earn the title of major multitasker. The company states that it works well on a number of surfaces, including curtains and couches. For the budget shopper, a popular choice is the Bissell CleanView, an inexpensive vacuum that claims to have great suction and a nearly silent sound.
Some other lightweight vacuum cleaners that earned good reviews are the Bosch GL30 Compact All Floor, Miele Compact C2 Cat and Dog Powerline, and Dyson V6 Fluffy. The Bosch is especially light, while still being able to carry a large amount of debris in its large bag. The Miele is good at sucking up pet hair. The Dyson is not only light and versatile, but it is reportedly cordless as well, making it maneuverable.