I have the silver one and a green one. The silver works better,you can feel the button click.The green one you have to press harder,and it cuts off quicker.They both work,just differently.Im really happy with the amount of time between bat changes.Im so happy with the V4L products.I dont think I would have been successful with the other ecigs.The fuss and mess was such a turn off for me.This is so much easier.