Dewalt, Hitachi and Porter-Cable all have top-rated cordless impact drivers available at Lowe's, as of March 2015. The Dewalt 18-volt 1/4-inch variable speed impact driver is compact, features a reduced-kickback mechanism and holds a full five-star rating. The Dewalt impact driver is priced at roughly $120, without battery and charger.
Dewalt's more-powerful 20-volt variant also carries a full-five star rating. This 1/4-inch variable speed driver maintains a compact design of 5.5 inches from front to back and weighs only 2.8 pounds. The 20-volt Dewalt puts out 1,400 pounds of torque per inch and offers three trigger-activated LED lights for added visibility. At roughly $200, this impact driver includes a hard case, two batteries and charger.
The Hitachi 18DS 18-volt 1/4-inch variable speed impact driver has a full five-star rating among Lowe's customers and is covered by Hitachi's lifetime tool warranty. Customers appreciate its power, lightweight design and durability. At a price of roughly $116, the Hitachi impact driver includes a hard case, two batteries and charger.
The Porter-Cable 20-volt 1/4-inch variable speed impact driver offers a high-torque motor delivering 1,495 pounds of torque per inch. Customers highlight its power, durability and easy-load chuck system. The Porter-Cable impact driver has a full five-star rating and is priced at roughly $130. Included is a soft case, two batteries and charger.