I installed the Game On Graphix one today. It's very thin, not like typical heavy CPOs that I'm used to with Galaga, Tempest, etc.
I don't know if mine was original but there are some slight color differences, the biggest being that the original has a "real" silver look to it where the repro is more gray. The original also had a heavy clear layer over the top of it where this one has a slightly pebbly finish (very slight).
I would say it's accurate graphics wise, a little less bright in red/orange but brighter in yeloow and thinner stock. It would do in a pinch but I don't think most people who know about games would say this seems original. If I were to put this under a clear plexi cover it would be perfectly fine.
I did have to cut holes and trim all 4 edges but no big deal there ... it cuts very easily with an exacto blade.