Cost saving are undeniable.  Even with a $180 mod, 5 tanks ($30), 5 liquids ($40), and $10 charger.  $260 sounds like a lot, but considering 2 packs/day analogs costs over $350, the choice is simple.  Paid for itself in less than a month.  Assuming I go through a 30 mL bottle in a week, which I do not, the cost is $8 per week in stead of the $77 for analogs.  Consider it an investment with almost guaranteed astronomical returns! Not to mention the health benefits!