Have a Kestrel DAS6 Dual-Action Polisher. Smaller backing plate from http://www.shinearama.co.uk/search.php?page=1&fcat=79
similar to the two on this page. Its diameter is 120mm, pretty sure its neither of the two shown but is very similar as I wanted a more flexible outer lip area to take on some curvey parts of my cars. (Just asked for something at Shinearama to resolve the 3M pad problem and they stuck the 120mm in my hand, no markings on it. So can't specifically say what the backing plate maker/part number is.)
Also for heavier cutting, I use Meguiars DA Microfiber Correction Compound D300 with a Meguiar's DA Microfibre Cutting Disc 5 which cuts in harder. It took some of the deeper cuts out but leaves a rough surface. Not to be used regularly. Used Meguiar's Ultra Finishing 205 to finish off when I used D300 which is gentler than the AutoFinesse as a finishing product.
Combination works on all three cars, two with 15 - 20 year old VW metalic paint/lacquer finishes. Results were consistant. Applied little pressure, just used the weight of the DAS6, first on slow speed each time to apply, then high speed to work the surface.