After the firmware update my FF2 combusted for the first time on High setting, coarse grind, and not overfilled. Had been using it for months earlier with no problems. Now after that first combustion it combusts 1 in every 5 sessions. My rose-tinted glasses are off, I was in denial about this Vape but it is definitely not worth the money. There's nothing special about it, it's the Beats by DrDre of vapes. I've given up on using it, and with their policy on returns there's nothing I can do about it.
If you are considering buying this vape, you should save your money.