Update: A year later I downgraded my rating from a 5 to a 3. Although my previous rating is still good, two expired batteries were used. At $50, that's too much to spend on this device. I ordered it to complement my large Dyson vacuum cleaner. This is perfect for a daily "touch up" as we have 6 dogs and there are always clumps of dust everywhere. Of course, it's better than lugging around a big boy, aside from the heavy weekly vacuuming. One charge lasts about 30 minutes, just enough to get rid of those corners where hair always collects. It maneuvers easily like my Dyson and the brush detangles all hair with ease. However, it's best to take them out every time you use them.