I don't pretend to know a whole lot about different buffers but I recently purchased a 1.5hp 8" buffer from Sears online and love it. The parts still get hot to the touch, but I don't wear gloves either. :O I think if you look into the information about various buffers I think that you will find that the horsepower allows you to apply more pressure without the machine bogging down. Mine is rated at 3450 rpm I believe, so are a lot of 3/4 hp buffers that I saw. I chose the 1.5 hp instead because it was an extra $50.00. Hope this helps.
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