I think you're making a wise decision!
Several folks whom I've spoken with are somewhat uncomfortable when first using the Flex 3401. It's quite a bit different that the Porter Cable style polisher, more powerful, larger, different feel but it works an area much faster...
Very quickly we become accustomed or very used to things and we don't like change. Don't worry, it's a natural thing but it's a side affect of being human, it's our comfort zone and none of us likes venturing outside of it...