All my Flashlights are ThruNite... I love them...
This is my Collection so Far:
Ti3, Ti3 V2, T10 V2, T1, Archer 1A V3, Neutron 2C V3, TC15, TC12 V2, TN12 2014, TN12 2016, TN12 V4, TH10, TH10 V2, TH20, TH30, TH01...
ThruNite T2 and TT20 are next on my list to get...
I agree with you about the customized 21700 cells... But I guess it will soon become standard, because a lot of Flashlight Models are using them...