I am seriously looking at one of these right now. I haven't had a good light for a while and I'm ready again. No specific purpose in mind, just miss having a badass light. As far as the $80 price point is there a better light out there? Are there any known issues with the m20x? What 18650 battery is most recommended? Can I use any 18650 or only certain mh ratings? Thanks in advance, I can't wait to get a new light!