Ok it's been out for a while is there a difference between the Puritank and Protank? The Puritank looks a lot like the Protank2 just wondering if it's better than the original. I don't think the 2 is out on the market yet but if it is. Is there a difference between it and the Puritank? I'm thinking about getting the Puri or the Pro2 just wondering which is best.