We played around with it quite a bit and DeWalt really means it when they describe the DCX6401 as a heavy-duty combo kit. This kit comes complete with the DC900 hammer drill/driver that sports a 750 unit watt motor, a self tightening 1/2" chuck and an all metal transmission. Not for lightweights, this hammer drill will get you through concrete quickly and easily.
The DCX6401 also comes with a high end DeWalt DC305 Reciprocating saw. The DC305 features a keyless blade change and the option to have the saw blade set in 4 different directions. At 3000 saws per minute with a 1-1/8" stroke length, the DC305 is as fast as a teenager shooting his first wad. The DC305 also has a 3 position adjustable shoe to set your blade depth if you need to.
Also included in the DCX6401 is the DC300 Circular saw with a 7 1/4" blade. The unique feature on this circular saw is that it has a key less blade change. The blade change mechanism is spring loaded so while it's a bit awkward to use, it's nice to not have to look for the wrench. The circular saw also has a 0-50 degree bevel capacity and comes with a rip Fence. And not to be left in the dark (bad pun, i know), the DCX6401 comes with the easy to use, groovy gooseneck DC509 floodlight. This light will run for 8 hours on a single charge of the NANO 36v battery.
Different from some of the other Combo Kits we've been checking out lately, the DeWalt DCX6401 comes with 36v Lithium Phosphate NANO technology (2-batteries plus charger). So, for about $400 below retail, you can get your NANO on for less.