Carto tanks aren't difficult..or even have much of a learning curve,really. Not anymore now you can get prepunched cartomizers and there are tools like the Slap Yo Mama to help out! Just assemble your carto into your tank, fill the carto with juice, fill the tank, seal 'er up and put on a drip tip and you are ready to go for hours! Take a "dry hit" from time to time to check that there are bubbles coming out of the little holes in the cartos (juice is flowing). Top off in a few to several hours as needed. Really easy and convenient. No tipping, no leaking, no muss no fuss.