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Hi Peter
I have had a 12” GSO RC truss for about a month and would agree the first thing to get your head around is the collimation of these and purchased a tak collumation scope to assists with this. The other thing is getting the back focus correct and getting the spacers correct has been a challenge. There doesn’t appear to be a manual for these and it took me a bit of searching to find something that actually gave me an indication of the spacers for various imaging trains.
They are also heavy - the 12 is close to 25 kg but the 10 would be a bit lighter. I have found it isn’t easy to get into the saddle on the mount but I am doing it on my own and can just manage it with care.
They are setup as an astrograph and don’t come with eyepiece or diagonal. I believe they do come with covers for the primary and secondary- mine didn’t and despite having chased this up immediately following delivery, I am still waiting for a response and supply of these.
Brian
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