I use the Vype e-pen - maybe a more expensive way to vape compared with the self-fillers from the local e-cig store. Having said that the e-pen has a good quick way of loading the liquid using the cartridges and avoids accidental ingestion. Another point is you can vape like using a pipe with these and keep the pen longer in your mouth- some of the self-fillers from the local store burn hot and have to be removed from the mouth after a quick vape. The e-pen is my current method of vaping - I have occasionally gone back to the old filling method using other e-cigs - but then always seem to go back to the Vype.