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While I agree with everything John B said from a technical standpoint, I only see two really significant problems with SCT's, those being cooling and the chance of getting a bad sample.
The vents on the EdgeHD scopes will make cooling easier to accomplish.
Light throughput isn't an issue with modern coatings. My C11 XLT is brighter than the less than 2 year old 10" GSO dob it replaced. I reckon a dob with standard coatings and an XLT/UHTC SCT must have very similar transmission on an inch for inch basis.
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