BG452510404 thisis additional feedback, I'm the same person. I just ordered 2 more of these ESC's so I will likely give a new better revieuw soon, got new propellors for the motor. I also accidentally used a faulty battery with reversed polarity on the ESC which meant it got - on and on - which killed it. I took that chance to open it up and look what was actually inside, mostly went to look if it was realistic for this ESC to handle 40A since that was important for me to concider buying a new one of this type. and givven I bought 2 new ones of them I was happy with what was inside. what was inside? for driving the current to the motor it had 12 mosfets, this means 4 mosfets per wire or 2 mosfets per wire per polarity. the mosfets where of the type mt30046s here is some basic info on them couldn't find a complete datasheet: http://www.mtsemi.com/en/product_class.php?id=1