The door on the koopor is strong with 4 magnets. If you are going to use the Silicon it is a pain to get on and off. The door will come loose when you try to take the Silicon sleeve. The xcube door is just loose in general and you'll find yourself playing with it alot.
I have two full ones, stainless and black. I love them. I go back and forth between them and Target tanks with the cCells. The trigger on the xcube is touchy. If it's in your pocket iron even just holding it it can go off if you put any pressure on it what so ever. That's why I daily carry...
You really have to tinker with it to get the VT to work. It works a little better on dual coil. Drop the coefficient all the way down and work from there.
comparing the X Cube II and the koopor plus side by side the koopor seems to have quicker ramp up and stronger hit under the same settings using the same tank. 75w reading .18 ohms on the full size tfv4 using the quad kanthol coil.
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