From purely a design standpoint the 'benefits' over shop-bought drills are intended to be:

-All-metal gears
-No need to modify/lock out the clutch on a drill
-Genuine shaft support from the dual 12mm ball-bearings
-A 550 type motor from a factory line usually responsible for ~$40 US-sold drills, more specifically the motors have larger fan blades and vents than most cheap drills. Can't really do specification comparisons though because cheap drill motors vary so much.
-Easy mounting in a solid profile which can itself lend to the structure of many designs

It's up to anyone to decide whether that's worth an extra tenner!