Hi, the Endura S1 is designed to be a next step for users of pre-filled disposable devices. Compared to pre-filled disposable devices, especially in regions limited to 2ml/600 puffs, the Endura S1 delivers a much longer life cycle, and far wider range of flavour choice and nicotine strengths. We understand the Endura S1 may not be the device for our customers who are already using replacement coils or pods and we encourage customers to use those products if they feel confident in replacing coils!