I have some good contacts to a company in Germany, that assemble with Samsung SDI cells. They told me, that Samsung has so far postponed the entry already twice. What I understood is that Samsung (but also LG and Sony) still have quality problems on cycle life and Voltage drop.
In any case I don´t believe neither iJoy, nor Efest with those 3750 mAh and 35A, or 40A. In Germany we have a saying: "wer einmal luegt, dem
glaubt man nicht, und wenn er auch die
Wahrheit spricht" - translated to english it would be: the one who lies you don´t believe anymore, even if he tells the truth.