I recently picked up both the 6" and 3" random orbital polishers from Griot's Garage (griotsgarage.com). When used with their machine polish and wax, they produce an excellent shine. But I'm biased towards Griot's and have almost their entire catalog of products. I agree that you should practice on a vehicle whose owner doesn't care about it. Once you get the hang of it, it's pretty easy, but somewhat time-consuming, no matter what polisher you use.
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