with Meguiar's M101 and the Flex 3401. Wow, it really worked great! The combo removed some deep swirls, oxidation, and finished nicely. Some might say it's the M101, which is in part true, BUT, I've used M101 with other foam cutting pads, and didn't get this good of result. Also, I REALLY like how it's so soft for a cutting pad. That makes it very easy to control. So, the 4th generation pad is even better?