The fireluke series are probably as good as you can get for tanks with drop in coils. Great flavor and consistent performance. The other evening I found a bit of some clapton wire and put a pair of coils on my dead rabbit. Did a side-by-side comparison. The results? Definitely the RDA with decent coils had the most flavor but since I'm vaping a chocolate flavor, the wick did foul up pretty quick and muted the flavor some. The fireluke stood its ground though so it was a hard call to make.