I have tried other E-Cigs, but the only one I use now is the Vype E-Pen. The E-pen uses non-spill caps so that the nicotine liquid never leaks out onto your skin or clothing (making it a safer options for those in contact with kids and pets). It's a reliable product, the battery takes no longer than 2hrs to charge and easily gets me through 2days before it needs recharging. And I use it a lot! The liquid contains pharmaceutical graded nicotine which comes in various flavours, and lasts longer than most brands as it doesn't leak. Vype products have been safety tested and meet European electrical safety standards, and Vype provide very clear guidelines how to use their products and prevent damage. It's also fun to use, as you can buy them in different colours. I have a purple one and a red one (I always like to carry a spare). I would highly recommend the Vype E-Pen, it really is a genuinely good product which has assisted me to quit smoking.