Robot vacuums are great for keeping floors clean on a regular basis, but they don’t catch everything. If you’re looking for a tool to handle the finer details your robovac might miss — room corners, edges, hard stairs, entryways, etc. — Dyson’s PencilVac Fluffycones is one of the lightest, most versatile stick vacuums you can buy. You can get one during Amazon’s Big Spring Sale for $449.99 ($150 off) at Amazon , Best Buy , and Target , marking a new low. The PencilVac is about as thin as Dyson’