I have had the egrip for about a week , and I love the all in one design with good battery life and 20 watts. The down fall is I can't get this thing to wick at all. I use Moon Mountain Vapor e liquid and I don't know the PG/VG ratio,but it is not wicking period. The only time I can get it to work is if I leave the fill door open and block the air holes and take some primer puffs. And even then, it only works for a few pulls before I get dry hits again. I ordered some replacement heads one hopefully they wick. Anyone have any suggestions?