Everyone who does any work around the house or puts together IKEA furniture (they specifically say not to use power tools, so only do this if you are careful not to over tighten) needs a cordless impact driver. There's a night and day difference between using an impact driver for screws and bolts vs a drill driver. And, if you're going to get an impact driver, you should get one that uses a brushless motor for added power. This one from Ryobi has worked out very well for me, but I made the choice long ago to go with Ryobi as my cordless tool set. I would not recommend buying this impact driver from Ryobi if you already have cordless tools from another brand (you should buy that brand's impact driver). The batteries are expensive and you want to be able to share them across your tools.