CAC does not make the best Rolex inserts in the world, Rolex makes the best Rolex inserts in the world.
CAC inserts are possibly the best aftermarket copies of Rolex inserts currently available. They look pretty good on a screen, though once in hand you can see there are quite a few tells/flaws.
All Rolex inserts, with no exception, have a specific fade pattern which is dependant on the chemical composition of the paint plus UV light exposure.
Some batches of inserts never faded to any noticeable degree, some batches of inserts faded almost too easily.
You will never see a blue backed 1675 insert turn fuchsia because the chemical composition of the paint doesn't allow it.
You will also never see a bluesy insert fade to turquoise/Tiffany blue because the chemical composition of the paint doesn't allow it.
Equally, 14060 serif inserts do not fade to dark charcoal grey naturally and any 16610/16600/16660 inserts you see advertised as 'tropical' have been heat treated to make them turn brown - it's a fake tropical insert.
I see from his eBay store that he now has many more inserts advertised as genuine. Some indeed do look genuine, but many of them have a totally unnatural color fade which means he's chemically/UV treating them to get the faded look - and faded inserts sell for more than non-faded inserts.
Sometimes he’s also not the easiest to communicate with.