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I have a friend who works with the regular DMT125/ 600 which are the all steel flat ones. He's used them for a long time and they work well.
I've always been a bit leary of the ones with polka dot...

Ditto Olivia that's what I do as well and you bet it's fast and makes a very nice surface as well. I should say a surface close to the original feel on my Nortons.