To my knowledge, Keith did not read my review, but probably not a fan of anything that isn't 100% positive of his lenses. That is understandable. It still doesn't make me subhuman. I know nothing about plastics manufacture, but did run my review by some people who are, and who were involved in the lenses. One of them explained what went wrong with the lenses. Quality control did not catch the issue, and then fixing the issue became a cost issue. A bunch of people were present when this was exposed. Keith asked to be called when the lenses were uncovered. I presented the issues, in the manner of observations. If I ask about negative aspects of your product, you can be honest, or you can be belligerent; you can address concerns, or you can attack anyone who has the audacity to point out obvious issues. I guess it doesn't get more simple than that. In a nutshell, Keith said he would ignore me. I did not cause his problems; they were all of his own making.
I have reviewed many products. In the newsletter, I try to avoid products that would receive negative reviews. Due to a review I did of a Trend Micro product, they developed a new product, and pulled the original. My clients were given 1 year free with the new product. That was way over the top, but the only way they found to address the issue. With the free offer, they included a message, "Thanks for your review. We fixed our product. Your turn." I submitted a new review. Try as I might, I was unable to find an issue with the new product. These are vendor product reviews, so only go to the vendor.
The lenses have a lot of issues. Some of the issues are shown in the newsletter article. Most of the other reviews of Keith's lenses were positive, and Keith responded positively to those. For other reviews, Keith's replies were...not helpful. I think my review was balanced, both in itself, and to other reviews.
The coating on the original lenses was a separate piece that was fused to the lens. Keiths are painted to the back side. The masking is poor, but I believe the coating will adhere. It would seem that CNC milling the coating away would work poorly at best on the flat areas, but be impossible at the curved edges. Milling would "scratch" the surface, or so I believe.