The Myth 1 does only have one burst disk (the high pressure one). The low pressure is actually an internal failsafe unlike others that are an external 2nd disk. Guerilla made the Myth 2 with the both external as people didn't 'trust' not having the low side visible. Nothing to worry about though with the Myth 1. I use it and am paranoid as hell about HP air systems at times.
Only thing I would suggest is you get a spare fill nipple and burst disk when you buy one. They are threaded differently than others so cannot be substituted for another brand.
Only thing I would suggest is you get a spare fill nipple and burst disk when you buy one. They are threaded differently than others so cannot be substituted for another brand.