I lived there for about 7 years. I really missed the rain.
Now in the bay area, even though the rain is still seasonal, it's easy to walk around with a trench as a light jacket. I don't feel I could get away with that in socal.
The length is a double-edge sword. You're right, it looks great (and it seems better put together than other trenches I saw from diesel... more water resistant, real side pockets). But its shortness is pushing the limits of being practical for wet weather.
It's true to size. I got it in medium, which is 90% of what I fit in diesel shirts and jackets.