FIREFLY 2. I used it less than 10 times and gave up on vaping for a couple years until I decided to give the Mighty a whirl. I couldn't figure out how to work the FF2 consistently. I got a couple of good hits off it but most of my tries not so much. I went back to combusting after FF2. It just didn't do it for me. It still sits here untouched, nice paper weight. After I went Mighty I didn't go back.