I actually have the WaxedShine WS21 and ran in a bit on my wifes older Audi. Seemed to be smooth enough for me and much quieter then my HF DA. I only polish 2-5 cars per year if I`m lucky so I couldn`t justifying spending the money on a Rupes. It corrected much faster then my other machine and I`m excited to use here, maybe this weekend when I do a full polish and coating on my wifes new GLE350.
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