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Doomsayer, as noted the RC don't cope well with missalignment the Tak scope will get me to within 20 secs of alignment and CCD inspector gets me the rest of the way. As Gama says these instruments tend to be made very well, even the "low" cost ones from Deepsky instruments. So they will hold their alignment very well. I think the Tak scope is the one of the best atro items I've ever got. The cost is repaid the first time you use one very easy. To give you an idea a 1/8 of a turn on any screw is very easy to see. Field curve can change a large amount even with a flattener if not alligned correctly.
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