I been using them a while for most things their competitive, but when I tried another Stoner's vap, it had issue only use it when plugged in defective, called local buds gave me excuses when hoping for exchange unless they can fix it. Used few different vapes, never had one just not work senior head rush from trying to get the medication needed. I am now looking at BBB or OMMA for help as been weeks now excuse no resolution other wise been better review. read more