Caution should be taken tho. As in the case of Chellie's example.....there is a warning not to use any other tops with this mod....can only support wattage and Nickel stock coils. Here is a warning I have found at mvs
Risk of battery Explosion! Ni 200 (Nickel) and Titanium (Ti) is designed for use only with devices equipped with circuit boards capable of controlling coil temperature, such as DNA 40 Mods. Do not use this product with any other devices.