Absolutely keep the PC. Besides the attachments Porter Cable 7424 & Ultimate Detailing Machine Carpet & Upholstery Brushes you can always use it to hit those hard to polish parts of the car by using a smaller pad (right now, the Flex does not come with smaller backing plates, so you can't use anything smaller than a 6.5'' pad). The PC is still the best choice for applying an LSP by machine.