I have a bunch of Kayfun Lites and a bunch of Kayfun v4's. I prefer the v4's because it is easier to get in to change the wick. With the Lites, you either have to empty the tank or use something like the Kayfil to get inside to change the cotton. With the V4, you can remove the deck without emptying. Oh, and I do 10 wraps of 28 gauge on a 3mm bit. Gets to about 2.1 ohms. Surprisingly nice flavor. Must be the additional surface area of the coil.