Firstly the tank: To load juice you have to remove an outer ring, which is very difficult to do. Once you get it off, you have to put the juice in with the tank sideways. I could hardly get the juice to go in, it went everywhere all over my hands and table. Finally, after most of the juice went all over but I was able to get a decent amount in the tank, I attached the tank the the box, only to find that the tank leaks everywhere. Horrible equipment. I give the tank 0/5. The box, on the other hand, is not bad. The kit comes with a replaceable 21700 battery, and an adapter so you can use 18650 batteries too. The battery seems to last about 7 or so hours of medium to heavy vaping. I got this kit because I was tired of having stick-type vaporizers die on me before half the day was through, so I got what I wanted with this kit. I give the box 4/5. If only the tank didn’t suck... EDIT: After trying out another "box" type vape, I realize that this box is really not that great. There are other boxes that are a few more dollars but have much more options and are easy to use. So, in short, don't buy this vape!