I understand the safety issues. I've worked with electricity/electronics almost as long as I've smoked. I let them do the build and actually just went back and had a new build done after doing some reading and seeing a better set up. I tried all the garbage like njoy and Blue and they didn't work for me. I feel this is actually working. So I'm glad they set me up with an advanced set up otherwise I might have been disappointed again with something else that didn't work for me. Just my opinion of course.