Loved it I bought it for a friend, but i used it for a week ! Being experienced with Sigeili, DNA 200, DNA 250, I was really impressed with this device , it worked FLAWLESSLY ! And was so very compact , packed full of great features , very tweakable . TC worked really good with TI (Sweet Spot ) wire .05 was great also SS worked great , I played with the w to TCR setting & really was a responsive chip , I really thought great buy for $50 that worked so well , was upgradeable . Make sure you use Version A = ,V or Version B = VR I believe before upgrading , I had V1.2.8 so I didn't find a need to upgrade everything was working like it should be , great mod ! Great Buy ,& very compact light , & smallest 2 x18650 mid I've seen ! I read about the paint deal but no biggy it can be fixed or polished off if need be ! I think mine may have had a good coat on it , couldn't see it coming off from just light use as some said ! May have fixed the paint issue on the layer built ones ! Seems so.. Think i may buy one for myself ! Really liked the mod a lot!