If you vape using a single draw type of vape, like a lot of folks do, then the WisMec type of preheat could work for you. I tend to "Chain Vape", meaning that I take a hit, release the fire bar and inhale, depress the fire bar and take another hit, fully inhale while releasing the fire bar and do it all over again in quick succession. With the WisMec type of preheat I notice the heat just keep building, and it gets too warm for me, even starting out at only 7 watts. Not so with the way AF implements preheat, that's why I can run preheat in Power mode now, and suites my style of vaping better, as only the first draw is with preheat, and subsequent draws are not.