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From a different viewpoint I have a ST9E with water cooling etc. It is very heavy when coupled with a filter wheel but my scope copes with the weight.
I almost never use the internal guider but use a QHY5 through a guide scope. I found that the lack of available guide stars to be too much of a problem. If there is a suitable guide star for the target I will very occasionally use it but often find it too much af a bother to change the cables over.
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