OK but not brilliant atomizers. Surpassed by newer models - these are only for "legacy" kits. By today's standards these are less than impressive, but for the time, they were alright. At lower power levels you'll get a decent cloud and smooth experience for 1-2 days depending on frequency of use. Then about a week of tough sucking and hot liquid droplets burning your tongue. After that, they'll be completely duff. At higher power levels, the cloud barely improves but the temperature soars: your throat will burn and you will gag. I recommend keeping your tank's air inlet fully open and use the minimum power rating for your coils if you are going to use these.