Here's a quick look at the specs, features, pros, and cons of the Fein ASB18 hammer drill/driver. This information was excerpted from a tool test in the Spring 2015 issue of Tools of the Trade. The main story contains an overview plus runtime and power test data for all tools tested.

Fein ASB18
Battery: 18 volts; 4.0 Ah
Battery gauge: 4 bars; on battery
Weight (pounds): 4.91
Rpm: 0-550; 0-1,600
Hammer Bpm: 0-29,000
Other Features: LED headlight
Price: Kit $380
Includes: Tool; 2 batteries; charger; plastic case with foam insert
Country of origin: Tool China; battery Korea
Notes: A stronger tool in the product line exists—a four-speed, brushless motor drill/driver without a hammer drill function rated at 50% greater torque—model ASCM18.
Performance: Rated fair under heavy duty uses; better suited for moderate service. Lowest performer overall. Eighth in runtime. (See comparison tables in Main Story)
Comments: Simply outclassed by the competition in high-demand tasks.
Pro: Where this tool could compete, it posted respectably fast times in low gear operation.
Con: Only tool in the test without a side handle which really limits its usefulness for powerful work. No belt hook, and no mounts for one.