I have a TR-001 as well. It's branded with Tenergy and not Trustfire, but I have no reason to believe it's any different from the Trustfire TR-001, which is available all over the dang place. It has never failed me, it is more convenient to use than my Pila since it accepts virtually ALL 3.7 volt lithium ion battery sizes, and it always charges them up to 4.20 volts. Sometimes up to 4.23 volts. My Pila does charge batteries faster but the smaller batteries typically terminate charging at 4.15 volts.
That's just my experience. Maybe Tenergy does better QC screening before they slap their logo on them.