I've got both and I prefer the Cyclone. My theory is, whichever you got first is the one you'll prefer. The main reason I like the Cyclone more is because the juice enters at a higher level and leaves more in the atty when excess is sucked back in the bottle. This allows for more vapes per squonk. There are other differences I prefer but that is the main one. Here are some of them: SS construction, cap held on with orings, smaller volume of chamber, closer posts, durability and cosmetics. The RM2 vapes about the same but I don't like squonking every vape or two to keep the wick wet. It does have some Pro's over the Cyclone: ease of building coils, insulated ceramic deck, all excess juice is sucked from deck, half the price. It's just a matter of how your priorities line up, mine give the edge to the Cyclone but its easy to see why somebody else might prefer the RM2.