I've been using a pc for 5 years. The results have been okay but not incredible. The car always looks shinier than before but it never seems to to get rid of all the swirls. I'm not sure if i need to step up a to rotary or i just need to find a better pad/polish combo. I've been tryiing Menzerna 106ff with an orange pad and it really hasn't touched the swirls on any of my cars. Before that I've tried Menzerna IP and that didn't do great either. Do I need to try Menzerna SIP or do i step up to the rotary?