I use the drill primarily as screwdrivers, drill bit change is now very quickly. By turning the drill I have not yet had. The drill sit very stable in feed. Against accidental opening there is an extra locking step.
Dielectric strength I did not test, because I have a hammer drill for such tasks. My feeling, however, that the chuck even when impact drilling makes no problems.
As a comparison, I have a Metabobohrfutter, and so far I can see no real difference.
I highly recommend it.
