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There are some excellent videos on Youtube showing the mirror cleaning process, and it's not difficult.
You need to also look at videos and info on collimating a Dob mirror, of which there is enough around.
You need a collimating tool to help with this, and what it's called has slipped my mind, but someone here can tell you what it is, and where to get it.
The photos of the mirror may make it look worse than it is if he uses a flash, because the dust on it will appear like large white spots covering it. Very hard to tell the condition from a photo down the tube.
The 10" is on the 8" base but is noticeably heavier and more awkward to carry. Some use a dolly cart to move theirs. Unless you are particularly strong, it is a two person job if it has to be moved 20~30 yards each way.
Frankly, having used an 8" and a 10" I would be happy to go back to an 8 because it's lighter, and I can't say I really noticed that much more detail in nebulas. Of course that may well be my optically challenged vision too.
Either way, you will love you Dob whichever you end up with. They are great scopes.
Trev
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