In addition to how it cleans, we wanted to assess the new features—a laser that sits atop a second brush head, called the "Laser Slim Fluffy cleaner head" and an electronic dirt detector. And while we didn't swoon over the Dyson V15, we do think it's a solid cordless vacuum. So good, in fact, that it's now the top Dyson in our stick vacuum ratings, outranking its brandmates the Dyson V11, Dyson V10, and Dyson V8 as well as almost 50 cordless vacuums from a dozen other brands.