Been messing around this winter with some fleet vans, from good condition to really beat. Have been using a lot of M101 on foam and D300 on microfiber (never thought of M101 on microfiber). All things NOT being equal Flex/M101/foam heavy cutting pad was 4 passes to clean up what took Rupes 15/D300/micro cutting discs 6 passes...assuming same general arm speed. That said, The Rupees was much less taxing so it probably evened out over the course of the entire (large) van.
Probably not that skilled yet with Rupes and Flex is more grab and go so a real Pro could likely move faster (and feel better) with the Rupes/D300.
Finish was pretty darn good with both...not much of a real difference.
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