Here's a quick look at the specs, features, pros, and cons of the Festool Quadrive PDC184 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.

Festool Quadrive PDC184
Battery: 18 volts; 5.2 Ah
Battery gauge: Colored LED; on tool
Weight (pounds): 4.84; with handle 5.38
Rpm: 0-400; 0-850; 0-1,850; 0-3,800
Hammer Bpm: 0-800; 0-17,000; 0-37,000; 0-76,000
Other Features: Brushless motor; electronic clutch; removable chuck; manually switched LED headlight; 8 7/8-inch side handle; stop rod; dual belt hooks; onboard bit holder
Price: N/A [coming summer 2015]
Includes: Tool; 2 batteries; charger; bit holder; stacking plastic case
Country of origin: Tool Czech Republic; battery Poland
Notes: Tool tested with 4.2 Ah pack but will come with 5.2 Ah.
Performance: Rated good to very good under heavy duty uses and a second-tier performer overall. (See comparison tables in Main Story)
Comments: Brand new brushless motor tool with complex features and advanced electronic controls that operate unlike those of more traditional hammer drill/drivers.
Pro: Four gears provide strong-but slow action in first and the fastest light duty drilling in fourth. In low gears, the motor seems to dig deep for power and finds it; moving slowly and not stalling under tough loads. Belt hooks on both sides of tool. LED headlight on base that must be switched on manually when needed provides nice control of the light. Removable chuck to fit other drive heads, providing versatility.
Con: Electronic clutch too precise to consistently sink fasteners into wood so you must set it higher or leave it in drill mode. Plastic belt hooks.