Oh I have been, but regardless, when you buy a product you need to rely on being right(people w/o vv/vw), it should be right.
The closest thing I have to vv/vw is ego twist batts that I've loaned out. I'm all mech now, and that is why i HAVE to rebuild kanger heads. My protank heads vape almost as well as my rda when they're sitting around .9 ohms