Self defense at 25 yards? Pocket guns are for what their designed for, highly concealable and for close encounters. Don't pull the trigger at 25 yards. You will need a better than good lawyer. Been in the courtroom many times over this.
I have had one for a year now and I love it. Others are very correct about the 3 pins correcting previous issues. Used to carry a G27 that I still have. DB9 looks like a small glock.
Over 150 rounds through it no issues. Very light great pocket gun. I use a Sneaky Pete holster for dress pants...
Not many places a girl can carry and dress up. Summer time forget about it concealed. I have a soft custom made holster stitched in a small Coach purse. Purse cost the husband more than the G27 in it!