Bought a brand new, all black, pioneer4you IPv4 yesterday from local vape shop. Worked fine until today when I got a "check atomizer" message on screen out of nowhere, so I checked connections and everything looked good. Tried 2 more rda''s and a tank, still, "check atomizer" - went to vape shop and exchanged for exact replacement. Got home and opened up my 2nd IPv4 to find scratches on screen, scratches under battery cover and a dent on the unit. Went back to vape shop and they blamed it on shipping. I never complain or return products bc I work in sales and I deal with customers every day, so I know what it's like to work with manufacturers and customers- but, I'm overall very dissatisfied with the IPv4 by pioneer4you. 3 trips to the vape shop and all I really got out of this situation is knowing not to buy anything made by pioneer4you. Going to just use my old sigelei 150w that hasn't had any issues since I bought it months ago. Happy vaping!