I just wrote to my friend Sal at ZainoBros, to see what he thinks. Here's his reply...
I've been testing the various Micro-Fiber products. Unfortunately, the jury is still out on them..... Some of them I tested are excellent and do not scratch... however some are terrible and definetely scratch.. The quality control of these products from overseas especially Korea is not consistent.. So you never know if they will be the same scratch free quality...
Even when using the same brands, I found the quality to be inconsistent.
It's a shame because I think the concept is excellent...
For now I do not use them.... I'm still lab testing... Stay tuned..
Unless they change their quality control... I would not use them on my paint finish...
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Thank You,
Sal Zaino
http://www.zainobros.com