I have had my Steamengine tank for about a year and a half now, it is still one of my favorite tanks. I have used all 3 coils in this outstanding tank, the 0.7 ohm coil is way too high for my taste. Not that it is a bad or ineffective coil....far from it, I just prefer a lower ohm coil, the 0.25 ohm flat coil are OK, nothing great nothing bad I get good flavor and decent clouds from this coil. What coil I really like is the 0.25 parallel coil, great flavor, some really outrageous clouds i can crank the wattage up to my usual 60-65 watts, I get just outstanding flavor large poofy clouds, just an all around great coil....for me. As we all know anytime we are dealing with sub tanks or RDAs, or RDTAs even RTAs the coil build the juice you use is all highly subjective. For me I can use the .25 ohm coil even though it is not one of my favorites, juice again I prefer max vg, creams, custards, some fruits, a lot of deserts, even a few of the so called coffee flavors. Currently, I am vaping Pancake Man in my Steamengine tank with the very last of my coils for it, a .25 ohm parallel coil, I had just changed it from the one I was using a .25 ohm flat coil I have been looking for replacement coils at a decent price. A lot of sites have them at $15 and up, not gonna pay $15-$18 dollars plus shipping for 5 coils. SIGH....I will continue to shop, my usual go to Element ape does not have them so I am stuck....any one know where a body can purchase these coils at a somewhat reasonable price, thank you.