Got a couple of these in the mail this morning and filled one with juice, set my twist at 3.6v and wow! Hits like a freight train! Taste was off just a little to start (maybe rinsing the head first would take care of that) , but it quickly started vaping clean after a half dozen draws or so. Will update after a couple days of use but I think this could be a big winner since it has replaceable heads. Here's a few pics.