I've tried just about every vaping product out there and crown7 batteries & replacement tanks are by far the best. I love the fact that the battery is adjustable for a higher or lower draw, as you prefer. I won't ever buy a different brand as even the battery life is far and above all other brands.
I know that E-cigs aren't marketed as part of a smoking cessation program but I've not smoked a 'real' cigarette in 6 months and finally I don't have a cloud of foul smelling smoke surrounding me, my clothes and hair. Also, my oxygen levels have risen from a low of 84 % to 98 %, really impressing my doctor. Thank you crown7!