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bintel & GSO are same factory in taiwan, skywatcher is chinese [synta]
essentially at this price point machine made mirror should meet a certain standard -can be luck if you get a good/bad one
things you should look for as extras to seal the deal:
-focuser, does it have 2:1, 10:1
-does the tube come with an extension tube - meaning it will reach focus with your camera straight away [& not have to have mirror shifted up the tube]
-what kind of screws are on the secondary/primary adjustments -the more screws you can adjust tool-less the better
-will someone throw rings into the deal as part of pkg/cheaply
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