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Hi Bart,
it has been advertised as a much better off-axis performer than the regular SCT´s hence the name edge-hd (high definition). So I would assume it has been developed to rival Meades ACF (advanced coma free) SCT´s. The edge-hd´s I think are fully compatible with faststar (shooting at f/2) and have carbon fibre tubes (that prevent focus shift under changing temperatures), so if you are serious about AP the edge-hd is the way to go.
I was considering the 10" version but since the new GSO Ritchey-Chretien scopes came out I changed my mind.
Hope that helps a bit.
Cheers
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