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Dealer hat off for a bit...
I know from experience that SBIG guiders and cameras are not phased at all by non-bell shaped stellar profiles. They guide brilliantly with oblong, liner and cross shaped stars (I've seen them all and then some)
As an after-market flatener, I'd probably look at the latest William Optics unit which would allow easy (ie don't need a machinist) fine tuning of optimal spacing...I am not aware of any other manufacturer who makes a similar product, but would be interested in hearing of better alternatives.
My overall impresion of the GSO RC's is very good. They vary a tad in spherical error correction, but nothing gross to be sure.
The RC design might have astigmatism, but they don't have coma, so within modest limits stars look round (albeit out of focus at the edges due the curved field) which I find much more pleasing than the "seagulls" I have seen in some Newts and SCT's.
...nuff said...
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