I only received this yesterday, but it's been put to immediate use and proved to be most efficient. I've tried several hand-portable vacs over the years, including a few B&Ds, and they've all been duly despatched for recycling! I currentl have a Dyson portable which was an improvement over the lesser devices, but I've already found this B&D Flexi Vac to be superior to the Dyson, being just as powerful, much more flexible in use and easier to carry. I have numerous diverse devices that use Li-Ion batteries, which are far superior to Ni-Mh, Ni-Cad etc. in terms of power, charging cycle and longevity, so that's a bonus with this Dustbuster.