At the very least, it can be helpful if you want to do not a lot more than make a record of something. However, knowing you're working on jpegs won't encourage you to try very hard, and neither will the lack of control on exposure, not to mention the bloody awful shutter release method! Sharp shots? I tried it indoors with flash and a mirror, and it took so long to expose that I though it had gone awol. Worse, the af began to hunt and try to focus on the refection in the glass itself... oh well, I always did use manual lenses by choice. Oh, I forgot to mention the problems associated with trying to see (and frame) your subject in bright daylight, without a viewfinder, and whilst trying to hold the damned thing steady with your arms at full stretch...
Samsung Galaxy Ace:
Rob C