Ash said:
The shutter is so quiet, you can use it for any purpose. I agree that 12 frames is limiting (there was a 24-frame add-on somewhere on the market I read about) or else buy a Rolleikin and use 35mm as well!
I like to think about it as something that demands you use your best judgement for taking that shot, really aim to get it right, since there is very little room/frames for error.
Here are three different examples of my experience:
1) I was right behind these two women, and it was so bright outside I could barely see the image on the focusing screen, so I had to guess the distance; I was off by a few feet:
2) I had time to take this shot; the girl was on her phone all the time, pacing. I waited for the time she'd turn, but didn't. I had only one frame left.
3) I had to think quickly. No light meter. Dark. I stopped to set the shutter speed to my best guess for f/3.5 (widest aperture). I framed but had to tilt a little because to avoid glare from a light above.
[url="http://www.flickr.com/photos/gabrielma/362150410/]
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If I had a DSLR with me, I'm sure I'd taken a few more takes, just to be safe. The ones that made you sweat are somehow also the sweetest. I don't care if there are those who say "as long as I have the image, who cares what I use". It's about me as a photographer, who cares how I take a picture. As a viewer, if you care, fine, but you should not talk down the experience of the photographer.
Have fun!