First I thought it was a disappointment. After trying different builds with this thing, I started liking single coil mode. Then I tried non-clapton single wire builds and it worked great. Better than single coil, I used dual coil 26g wire spaced wrapped x6 and vapes best with one open air hole. Wicks great with silica wick installed with floss threaders so I fell in love with this version of the Avocado because of its bell shape. It burns too much when using big builds. The 'useless' slide seems to be for bringing the wicks closer together but its too loose.