I have the Griot's DA polisher as well. It worked great for me. According to what I had read about it on a detailing forum, it was highly regarded since it was more powerful in some way or another than the Porter Cable and had a lifetime warranty. Another reason that I personally think the Griots is good is that the handle is dead center over the head of the machine. But, the Porter Cable works great from what I've read as well.
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