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Some of the mass produced large dobs can have very ordinary mirrors meaning you never really get the performance promised.
Neither of those advertised have GoTo, which is getting more and more important to buyers. Not many learn the skill of sky hopping and reading charts.
I had an 18" SDM and regretfully sold it recently. It had the works, a superb mirror and a beautiful smooth motion. That is the joy of a big Dob.
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