i just bought the pc last month and have used it twice. i had no previous experience machine polishing. i was also debating the pc vs the flex. worried that the pc wouldn't be enough but i used it on my lady's severally swirled g6 and i was more than impressed. i also go the 4" kit too so i figure once i cut my teeth with the pc at least i will still have it to use the 4" pads as i do plan on everntually upgrading to the flex. i have no regets getting the pc