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I have a vanilla GSO 8" f4 (from Andrews) and it is really very good optically - basically diffraction limited on planetary imaging and fast for long exposure imaging. The secondary is small, although the vignetting can be corrected for in processing and is no big deal. The major issue is the focuser - after months of messing around with odd shaped stars have finally decided to ditch it and get something that can carry a camera without sag. And of course you will need an MPCC or similar coma corrector for wide field imaging. All up though, it works much better than it has any right to at the price.
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