So I thought my 801 atomizer was doing great because it was producing great vapor after 2 months.... well during the last 2 weeks of that month (died today) it tasted burnt all the time and I kept topping off and dripping thinking that the cart was just dry.... It wasn't - the atomizer was dying but I was in denial. As soon as I switched to a new atomizer I finally tasted how 555 and RY4 are supposed to taste - what a waste, I've already killed at least 1 20mL bottle on bad flavor. I haven't topped off in nearly an hour and the flavor is still here. SO CHANGE YOUR ATOMIZERS IF THE BURNT TASTE DOESN'T GO AWAY!