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Rajah,
I collimate each imaging session to ensure that I get the very best out of my scope. Most of the top imagers suggest at least checking the collimation each session. Yes, while it is a very good scope it does have its flaws. SCT's do hold collimation very well but little knocks can cause small deviations, as does weather conditions. So I like to fine tune the colllimation. Usually no more than 1/16 of a turn. I have seen SCT's that have never been colimated, they look good at 200X but when you whack a barlow in the image degrades so much due to the collimation.
Anyway, thanks for asking sometimes I wonder too.
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