I bought a Dewalt 257 about a year ago to fix drywall problems, but the gun never worked well for me. Sometimes the clutch would disengage with a satisfying pop and the screw would be set at the correct depth, other times, the bit would spin in the screwhead, stripping it and leaving it high. I tried a variety of depth settings and techniques, but rarely got the "pop". In the end, I wasted more time with this tool than I would have with a drill.
On the advice of Dewalt customer support, I the tool by one of the support centers yesterday. The technician told me
1) The clutch is not intended to control the depth the screw is set. It exists only to enable the operator to insert screws into the unit more rapidly because it stops spinning.
2) The depth of the screw is solely controlled by the nosepiece; when it encounters the work surface, the operator must release the trigger to stop drilling.
The technician's statements do not match my understanding of how these units are supposed to work. Is the technician correct?