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Generally the secondary is the only element that needs adjusting on a SCT and collomation is done either on an artificial star or real star - rough collimation is quick to achieve then it's a matter of little tweaks to get the first diffraction ring even all the way around for perfect collimation. You can't use a laser for SCT collimation. Then there's the issue of getting the scope cooled; the vents on the EdgeHD help with cooling or you can use a Lymax cooler for a Meade.(there are other methods too).
I haven't owned the GSO RC but have seen many posts complaining about collimation difficulty - the collimation has to be really spot on due to the hyperboloid mirrors and you can't rely on the factory to have the mirror seperation correctly set. I've seen a couple of references to the Tak collimation scope making colllimation much easier so you may need to factor the cost of that into your buying decision Erik. Cooling is obviously much easier with the open tube. The GSO mirror quality seems to be decent.
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