i think i have decided to start off with the kr808d-1 kit because from what i have read it is dependable, decent bat life and i like a strong throat hit with good vapor production and this one seems to fit the bill. the site has 2 kits. 1 with hard tips and one with soft tips on the cartomizers. What is the difference? also it comes with 6 cartos and from what i understand 1 carto is = to about 12cigs. how many times can i refill them on average before they are done with? im just trying to figure out the lifespan- for example if i can refill them 5 times on average then 1 carto =12x5=about 60 cigs thanks for any response