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FWIW, My 10" GSO Dob also has the rust problems as I may have mentioned a few times here but I suspect this may have more of a bad batch than a standard feature.. as far as the mount is concerned I haven't noticed any issue with water absorbtion or general build quality, I haven't done any mods to either Alt or Az (mine came with the teflon pads I believe earlier models may have had a dodgy roller bearing for the Az) and although the movement may not be "silky smooth" I find it perfectly useable.. The vast majority of comments I have read about GSO mirror quality are positive, especially for the money.. I certainly enjoy the views thru mine and suspect you would have to be a real expert to find much fault.. certainly not a problem for a first scope. The only things I would suggest is to buy it from a dealer who will center-spot the primary and demonstrate collimation for you - this will greatly enhance your initial enjoyment of the scope and maybe ask them whether they will offer some kind of rust guarantee? All things considered you won't go wrong with a GSO dob..
Bruce
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