I've been vaping for 3 years and no one has ever noticed my little 510's until I switched to the massive eGo a few weeks ago. Yesterday at the mall a store employee complimented my eGo setup and asked a few questions.
Today I was walking around downtown Montreal vaping when some cops noticed my device, turned on their lights and stopped me. They asked me what I was smoking and I explained to them that it's an electronic cigarette. They told me they had never seen one before and thought I was smoking drugs. I was surprised they had never heard of e-cigs before, they're for sale at every convenience store here!
They thanked me for entertaining their questions and I was on my way after a few minutes.
These bigger ecigs are much more convenient but definitely not discrete!