I've done some lasering on blank ceramics...it definitely looks a lot better on printed ceramics. I don't know this seller, but I would be wary of someone saying the chips are "the same as Chipco".
I have met this seller. He usually frequents some of the Flea Markets in my area. I have purchased a few singles for my collection. I haven't see the blanks that he's selling. I really haven't been to the Flea Market since the fall of last year. I don't know if that helps but I have never had a problem when dealing with him in person.
I would say with the lazering you still need some sort of color on the face of the chip or a big pot of them with 2 or more different denoms would be a mess to sort out.
I saw these a few days ago and thought they would really only be worth picking up if you could get them for dirt cheap, and send them to get printed. If not, they're pretty useless IMO.