The clone you getting, make sure its the one with the skull on the box. The one's without are complete crap. I, too, bought a clone goon at first. Wasn't long till I went ahead and got the authentic!
Also, yea, what
@crazyhendrix said, you will be able to taste the difference way WAY before your cotton gets even a hint of being burnt.
I like the kayfun mini v3 for a proper MTL! Had the NarDA clone, cleared it off my hands in a few days, not really my kind of RDA haha, I think the snapdragon might be a better flavour RDA