I started out with the cheap N Joy chargeable one with replaceable "filters" It was like trying to suck yogurt through a straw. Very unsatisfying almost made me think vapor was bull... Then someone told me I had to get the kind that held different liquids, was refillable etc. I figured all those users couldn't all be wrong so I got a EVOD, it has a slot for viewing the amount you have left, but is not clear like the ones that show the dark liquid inside and look nasty IMO. The clear ones I see make me think how gross, cover that up it looks bad.. It holds a charge for me for a few days, depending on use. It is so much cheaper than cigs, after the $30 initial investment.
I have been going down in % after initially going up to the strongest.. Planning on making my own and trying essential oils. I got extra wicks just I case a ruin mine. If this works I will have to get another stick so I can have a hit of nicotine when I want it without changing liquid. I will get another EVOD if I can find it, I love the one I have, and even tho the color is wearing off, why switch when you couldn't be happier with what you have.