I have tried the cotton wool method and the five gauze discs method and both work. The I-Inhale is poor for eliquid when dropping the juice directly into the chamber as it just boils off too quickly. The cotton wool and gauze methods allow the vaporization to occur more slowly. Remember, PG has a lower boiling point than VG so VG should vaporize more slowly. I only use PG and it is still fine.
The catalytic reaction of the I-Inhale is excellent, the reaction is only incomplete in the first second or so of the initial warm up. If you can smell butane, the unit is either not lit, or it is faulty. The vaporization chamber is also sealed from the reaction chamber. There are many comments about safety from the manufacturer on the FC forums.
A few tips;
The unit uses 1ml of gas per hour, so a 250ml can of butane should last 250 hours.
DO NOT OVERTIGHTEN THE CENTRE HEATING PIN
Some users have stripped threads and had to return under warranty
Stick to mainstream butane brands such as Colibri, Braun, Newport Gas and Ronson in Europe. Do not use Ronson in the USA
Andy