Hey Orestis, i own a 10" solid tube GSO that was originally came from Andrews ( i bought it used ), it has excellant optics.... but... i had some troubles with transporting it in my friends car which is smaller than my mums 4 wheel drive, if i had the money, i would go for the collapsible one and save the hundread bucks for a telrad or a cooling fan... However I love my GSO... I will never trade it for anything... (until aperture fever sets in)
Cheers,
Tony
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