They are pretty reliable and slim but the positioning of the
mag release leaves something to be desired- it's not that ergnomic.
And yes, 9mm is enough, if you put the bullets in the
right place. (I reccomend loading it with 124gr +P
GDHPs).
If I could get away with carrying something bigger, though,
I would reccomend the G19 over it, hands down, just about
every time. The G19 is easier for me to operate due to
the extra grip length... and it just seems to point better for
me than a 26 does. And you get another 5 rounds on the
burner, too. This part is pretty subjective, though.
Some people like the G26s frame better than the G19 type frame,
etc.
-Mike