The 30w iStick by Eleaf is quite similar to the original 20 watt; 2200 mah, adjustable wattage/voltage, passthrough functionality, clear screen, etc. However, there are 2 key differences. The first is, of course, the bump in power to fire up to 30 watts. Another awesome new feature is the ability to fire cartomizers as low as 0.4ohms. This allows you to use all sorts of rebuildables as well as all of the sub-ohm cartomizers that are coming onto the market! It also now has a springloaded pin for a quality-of-life boost.