It just shows the various differences between some nicotine sellers. My MFS from 18 months ago is perfectly clean no pepper taste or harshness,that is vaping unflavored at between 20mg and 30 mg 50vg/50pg. My ECX i got two years ago was nearly unvapeable at 12 mg 50vg/50pg unflavored and that was from the day it arrived. So peppery it was untrue. Maybe i just got lucky with the MFS and unlucky with the ECX.
I was a little concerned with the comments I read here after ordering from ECX. I'm hoping the reviews on their site are representative of current product.