My Thrunite Neutron 1c Neutral version arrived just a few minutes ago. I had only Soshine RCR123 (unprotected) batteries with me and tried at once with one of them. Here are the marks for my first impression,
* Has the same low lows of a Quark 123,
* good knurling,
* matter finish than my Quark,
* some internal edges look sharp
* light has a great, useful flood beam
* Neutral color is the best, nowhere green, nowhere orange warm
* High is really high even without an IMR
* Would like to have a clip and/or lanyard with it but only a holster and o-rings came in the box
* Loved this light.
Even though there is very little difference in usefulness and output of a Quark 123 S2 and 1C, but 1C seems to have memory and a better tint with a floodier (broader) beam. Thrunite 1C is nice, maybe 1A needs a 14500 too :)