Which one? I am not a professional detailer but want to do some of my own work. I have been wanting the Porter cable for a long time because I know how safe it is even in the hands of an amateur but now that I am ready to get one I am reading about the Flex. Is it just as safe? Which one is better? I saw a video on youtube where the Flex did a better and faster job due to the RPM speeds and now I'm curious. Thanks for any help