CPR's mirroring is pretty good. I think the original glasses are a tad shinier but CPR's mirroring is definitely not grey. This image from their F-14 glass (which I've ordered and can confirm) gives a good idea of how it looks.

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Had no idea that producing mirrored backglasses was so hard and also always wondered why they were able to seemingly do it for every game back in the 70s/80s but can't do it now. Definitely curious to learn more about the process they used back them (did they legitimately just screen print onto a full mirror?)

With that said I think CPR's mirroring is pretty damn good all things considered. I'm very happy with my PinBot, F-14, and TZ glasses.

Also what prompted Williams to make official repro parts for a 15 year old game in the mid 1990s? I find that fascinating.