Its a very simple system just screw on a cart and go. How some of us manage to make it complex. I got two regular manual batteries and PT with my initial order. Since then I got a long manual and a regular auto batteries. I find with different carts I like different batteries. Menthol, which In hardly ever smoked in analogs I like a lot and seems best with the auto. Refilled carts I especially like on the PT or the long.
Then you get in to different strengths. A friend bought it, and loves it, thank goodness I kinda hate recommending things. Against my advice though she bought 36mg carts. It was too strong for her so I ended up trading for them. They are perfect in the morning or when I need a good hard hit. My normal is 24 but if I find my self at the pc or times I'd normally chain smoke I go low to 12.
I got cherry carts that initially I didnt care for. Understand too after 25 years of smoking my tastebuds are fried. On a whim I add some 555
juice to a partially vaped one and I love that. The rest I vaped a bit then add a couple drops and its just as I like.
I even like different menthols or different tobbaco ones during the day. I really haven't tried much of the wilder flavors but I did the a dark chocolate as freebie and I loved that.