Average Reviews:
(More customer reviews)I install garage doors, and my impact wrench is my number one weapon. I have owned a 14.4 Milwaukee, 14.4 DeWalt, 18v DeWalt, and now this one. I had to send the Milwaukee back numerous times because of it's poor build quality. I have had motors die on the DeWalt due to its poor cooling design. There are small plastic fins in the motor which move air and keep the motor cool, and they have broken of on every DeWalt impact I have owned. I have been using the Hitachi for more than 4 months without a problem. I look actually look forward to using it. The battery stays secured to the drill, even after a four five foot fall. I laughed at the little light it comes with at first, but it has come in handy in dark garages. The torque is strong enough to pull the lug nuts of a wheel hub, and the battery life is stellar. One battery will get me through multiple double sized garage door installs. The DeWalt would kill at least too full batteries in only one install. It's safe to say that one Hitachi lithium-ion batter = 3+ DeWalt NiCads.
Another reviewer has mentioned a bad smell from the motor. All my impacts, drills, saws, and other power tools have gave off burning odor during the break-in of the tool. This is normal.
One other component of the impact which I enjoy is the pin. Unlike the DeWalt, the pin is designed to keep the socket secure when the pin of the impact is in line with the hole of the socket. The socket WILL come off of the impact with a little force unlike the DeWalt. With the DeWalt, the pin had to be compressed with a nail or screw in order to remove the socket.
To sum this review up... Buy the Hitachi.
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Hitachi WR18DL 18-volt Lithium-Ion Cordless Impact WrenchProduct Description: Think that all impact wrenches are bulky, heavyweight behemoths? Think again. The new Hitachi WR18DL Cordless 1/2-inch Square-Drive Impact Wrench is compact and lightweight at only 6-5/8 inches long and 3-1/2 pounds. But don't be fooled by its size and sleek styling. This is a powerful nut-busting, bolt-rattling pro-duty tool that's fueled by a never-say-die 18-volt lithium-ion battery.
The WR18DL Impact Wrench produces an incredible 1,950 in./lbs. of torque for tightening and loosening the most stubborn nuts, and hex-head bolts and screws. It comes with two high-capacity 18-volt lithium-ion batteries that have three times the life span and half the weight of nicad or nickel-metal hydride batteries. The two-speed tool can be used in Power Mode (zero to 2,600 rpm) for full-speed applications, or in Save Mode (zero to 2,000 rpm), which provides greater control.
The square-drive chuck accepts all 1/2-inch sockets. The tool features Hitachi's unique Cool Flow system that delivers a steady stream of air to the motor, allowing the wrench to run longer without risk of burnout. It also has a replaceable carbon brush, and five-position belt hook that has a built-in LED work light. The WR18DL is covered by Hitachi's industry-leading five-year warranty.
The WR18DL impact wrench comes with two 3.0-amp-hour lithium-ion batteries, a quick charger, and carrying case. --
Joseph Truini Unique 2-step speed switch give the ability to select between power mode or save mode. Designed to feel like a 12 volt while experiencing the power of an 18 volt. Circuit technology prevents battery from losing full power when in use. 
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