Here is a picture of a Co-ax.
I don't like reaching up so high for the handle so I would not try one. I started loading in 1953 with a Lyman Eze Loader which has a similar reach up handle and when I got my RCBS A2 in 1961 the EZE Loader got pushed aside. Its still on the bench however.
Recently I got a RCBS Supreme which is one the topic presses. The press is made ok but in order to get the maximum stroke they have the shell holder going way up into the top of the press.
What happens then is that the die does not reach down so if your seating a bullet you have to let it go from your fingers long before you would with the A2.
So I would not recommend either the Co-ax or the Supreme. Nor do I have one that I would recommend. Used A2's are way too hard to find. I would look at what Redding has however but I have plenty of presses now. I am keeping the Supreme.