Here are my .02 for what ever they are worth. I started with a PC, got a Flex immediately after. I detailed on the side for 10 years, and picked up a few long throws over the years. Then i sold my Flex just as I started doing this full time. I regretted it instantly. Why, like Mike says, you can plow through a car faster. Most of what I do are one step paint corrections, and the few multisteps I have done, a forced rotation would have made the cutting step quicker and more effective. But when doing a one step a Flex will get you more cut in a shorter amount of time