I must second this, I wasn't really sure about the pre-built coils just because I always figured making them yourself would be the way to go. But damn I have to say I'm extremely impressed with the flavor on this tank. Now one thing that kind of pisses me off about this tank is that there is no TC coils for it so it really limits people to power mode, in addition to this if you do chain vape off it the top will get hot. I guess that's why they give those weird rubber top sleeve things to keep it cool, but all in all its an amazing tank for the price.