Hi, first post, but this thread drew my attention.
I agree with Buggainok in a sense. While there isn't anything particularly dangerous about an e-cig in public as there is with cigarettes, that doesn't necessarily make them the most polite thing to use in an indoor public setting, either. If you're using flavored e-liquid, it still produces a light scent, and while most will find it to be a pleasant hint of something in the air, there are many people who are sensitive to certain scents or simply find such things to be offensive.
As a funny example of this, my boss won't let me use mine at work because it produces enough odor (albeit pleasant) to be deemed distracting or potentially offensive to others. Our compromise is that I can use it right outside the front door instead of having to take a walk around the block like I used to when I smoked.
All that said, it really depends on the social setting you plan to use it in, and if you're in a comfortable relaxed environment, use what feels comfortable to you. People are less likely to have their attention drawn to something you handle comfortably and with ease.
I use an eGo-T battery with a pretty stock-standard CE4 clearomizer. Since I feel awkward referring to it as an "e-cigarette" because of its shape, I've taken to referring to it as my "portable hookah".
