We have an 18v drill/hammer and a 1/4" impact. I am very impressed with them and they are supposed to be interchangeable with the old batteries. They are lighter and they run hard until the battery dies. The first time the battery died on me I thought it broke, it was running like it had fresh batteries and then it just stopped. I don't usually like dewalts, but these pair have been pretty good. The hammer drill combo is ok as a hammer drill, I wouldn't use it for much more then tapcons.