Simple to use and dispose of when finished with. None of the hassle often associated with refillable, rechargeable or devices you need to changes coils in. These small vapes are great for giving up smoking as its a format we are familiar with as a smoker. Simply take one out of the packet use it and dispose of it. If you are looking for something a bit more longer lasting then a pod system maybe right for you. These come as either pre filled or refillable. The pod essentially holds the liquid and the decission you make is pre filled for convienience of never having to fill or change a coil like the NZO kit or a complete refillable device that you can use your chosen eliquid in.