I just got my boge 2.0's in the mail today, first time I have ever used them. I filled the first time with a syringe, quick, easy, no mess and started vaping immediately. It is awsome, love these things. I have topped it off a couple of times today and I top it off by just dripping in it. It soaks up easily after the initial fill. I have tried ce2's, fluxomizers, dual coil, vortex and these boges are going to be the only cartos I use from now on. They are easy and they work great plus I don't have to worry about being careful with them. I did try my friends 3.0 boge on her 808 and it does not perform anywhere as good as the 2.0 on an ego.