So far, after five days, has not been a good experience. I did the update to v38, but that made no difference. On Kanthal builds around 1.3 ohms, resistance jumps from .7 to 2.1 randomly, pushing so much power that the cotton burns. SS316 temp control is hit and miss. Failed the cotton burn test at 420F. Resistance will jump around if the atty (Kayfun mini v3) is slightly loose. Not recommended.