I have upgraded to the XFI 2.0 and took the XFI 101 class in Plano at the first of June. During the class we touched on the boost controller feature and I going to give it a try. I would like some information on a C02 Boost controllers. My number one question is at what bottle pressure does the controllers operate? Secondly, who offers the best bottle and regulator kit? Of course, just like everyone else I have a budget to follow. So please give me any ideas that you guys may have.