I love mine. It was $20 pre-ordered and shipped from China. Yes, it is a hybrid cap so you absolutely must use an atty with a protruding 510 pin. My only gripes about it is the button. It works fine but the throw is a bit short and its a pain to tighten all the way down and unscrew. However there is a slot in the top to use a coin to unscrew it, I find a nickel works best. Its absolutely tiny for a dual 18650 mod and fits very nice in the hand. I was worried I wouldn't like the detonator style firing button. But the way I hold it in my hand my pinky rusts under it and the button press is very natural. Ive got a velocity clone on it with a .32 ohm clapton build that vapes very nicely. At $20 it was an excellent buy and really its a no brainer.