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Glen
I made the jump from a 12" GSO to a 20" Obsession clone. I have absolutely no regrets and I love the scope.
BUT you really need to be a dedicated deep sky observer to get value out of these scopes.
Setup time itself is not that much more than with the 12" at about 20 minutes compared to 15 with the 12, but alot of that was due to me accesorizing the 12 in ways I couldn't with the 20.
It is big and heavy and requires 2 people to safely load and unload if transporting by car. At home however, I handle it without any issues.
If looking at the ultracompact Obsessions, just be aware if you have neighbours lights, streetlights etc, the upper baffles are not super effective.
Peter at SDM gives excellent service. Even though I haven't purchased from me he has on 3 occasions allowed me to pick his brains for info and advice. If I was buying a new big dob, he would be my first port of call.
As far as the image goes, there is no comparing the 2 scopes. In the 20 I can pump the power up to 317x in the trapezium and easily see the E and F stars. Eta C looks simply amazing and faint Galaxies just pop out all over the place.
Malcolm
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