Maybe something like the a7 compared to the Phoenix? If I remember they were kind of close, but then again different
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The A7 is the only rda that I use anymore. The difference is that the A7 is bottom air instead of side air like the Phoenix. It's strictly MTL, but the A7 is the flavor king of all RDAs. I use 1/3 of the amount of flavoring in my formulas that I used with big diameter RDAs