I have a 20 year old 7335 which has only 50+/- hours on it. The current 7424XP has a larger motor (4.5 vs 3.7 amps) but it also much heavier. I am not as young as I used to be and want a tool that will make polishing my cars easier. I thought about the Flex 3401 but think I should stick with a free wheeling design. Anyone have experience with these two models? Does the benefit of bigger motor offset disadvantage of extra weight? Thanks.