Ive been learning but im still very very confused on what type I should look for... Ideally I want it to do - Wax Oil Glycerin concentrates Alcohol concentrates But I will accept any combo thereof as long as it does multiple formulation (IE not just oil or just glycerin). The atmos bullet to go and atmos a-pen have both been recommended and are reasonably priced. Though I don't know what ongoing maintenance replacement parts are required. The really important thing for me is tanks/chambers I can fill myself. Anyone have a moment to school me in pens or point me to where I can learn more specifics so I know what products to consider? My solo is great for starting but not what I want for a quick out on the town hit.