A well-known telescope maker looked at the sky with my GSO 12" reflector last weekend and wrote to me:-
"..... how good your mirror is. It's actually in the small handful of the very, very best I've ever seen!!!"
So that expert opinion suggests that GSO optics can stack up well.
I tried to answer the question of Skywatcher versus GSO some time ago:-
http://www.iceinspace.com.au/forum/s...ad.php?t=32880
but no definitive answer.
