Purchase the doctor diet I purchase a 12 pack on a monthly basis and I have found the taste to be inconsistent more carbonation than taste. This is about the only diet drink that I like the best and it's ithe consistency in flavor has not left me wanting more. I understand that the shelf life is affected and therefore more carbonation is preferable how ever too much carbonation has been distasteful and unsatisfying. product. User's recommendation: Drink Dr Pepper zero at this time it taste better.