I agree with Ed that the Luger design is an old one that had it's popularity as a carry piece a long time ago...
But even in those days it would not have been my first choice. How about a Fitz Special: chopped down New Service 45 LC or an old 1911...
9mm is not my favorite defense round. I tend to like big bores. Compactness is also a factor I consider ( reason for that Glock 19 )
Also that Luger safety is not the fastest around and I'm not so sure I'd feel confident to carry it cocked & locked.
Bottom line is that there are superior modern defensive pistols available...
kidvett