if you get burnt taste, GET CARTOMIZERS!!! i got mine in today, and all i have to say is : its the difference between night and day! the flavor is great, the cartos vape for close to 4+ hrs between refills, and they are CHEAP AS DIRT, i paid 7$ for 5 of them, and i am very hapy with them.no more melting plastic, no more crappy tastes... btw, get the usb passthru too, the one with out the step down box on it. it holds at 4.2v and it works WONDERS for any 510 ecig!