I purchased a Covington 6" Diamond combination unit from an Ebay seller about a month ago. The White polishing powder that came with it did a fair job but the Cerium Oxide is much better.
One thing that has sold me on Covington Engineering is the care they take in their packaging and shipping. The 6" combination unit was packed so good that you could drop it off the roof and it would not have been damaged.Don
14th Jan 2016