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So far the GSO RCs optics don't seem to be the weak point. A number of sharp images show that. Its more the difficulty of collimation, the poor focuser, the lack of flatteners, the lack of a flattener that corrects the whole field, mounting of the primary mirror at one stage seemed sus with just some silicone and clips in a 3 spots.
But as an emerging scope maker the option to make it work is still pretty amazing as 20 inch RC/STL11 images by some well known top names from 8-10 years ago still have not been bettered today.
If I were to get one (which I am not planning to) I would treat as a potential project that may take some effort to get into a workable system and that is part of what your discounted price is taking into account. 5 years from now they may have upped the focuser, flexure, reducers/flattener and temp control issues better.
Greg.
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