OCDetails is right about the flex. There are two different types...rotary & DA... two totally different worlds. You need both in your arsenal. People need to be more specific on there questions.
Put my new flex 3401 to work over the weekend on a mini detail with some Meguiars 151. This machine has some really power. I have a wet sand job comming up, will see how it works on that.
Thanks to all for the good info on the Flex. Jim