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I have a 12" GSO mirror in my dob: when I got it the manufacturer's specs for the mirror were better than for the mirror in their dobs... It turned out to be a very good mirror, with Ronchi testing and star tests showing an excellent figure.
The main difference between the mass-produced mirrors like this one and the more expensive hand-figured ones is the QC (and the love!). You can be lucky (like I was) and get a really good mass-produced one, but you are guaranteed of a really good one if you go for the top-end ones.
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