The GSO's seem quite good but the Televue everbrite is certianly a step above. The Televue is lighter and generally better finished, including the function and construction of the compression ring. I can't give a critical assessment of the mirror. That said, I wouldn't be paying $500 for a new diagonal, and the GSO seems good enough. I had to remove the brass compression ring from the GSO and reshape it to fit proprly in it's groove.
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