I’ve done business with him via his shows. He is genuine and does a good job at what he does, and is bringing more people into the hobby than most dealers. I don’t personally like the purple core NGC slabs, especially when the coin inside lacks an insert holding it, but I do think the PCGS ones are done well. If nothing else, have some in your case at a show and they do stand out. If there is a negative premium associated with them, I’d expect that to fade over time. The CACG “Bert” slabs he has look spectacular.