I have a telrad and find it a very good and helpful tool...I like it a lot and would recommend it to others!
I find the red ring (bullseye) helpful in "estimating" position from known stars.
Do be aware that it does have a tendency to "dew" so you will need to make (or buy) some kind of dew shield (or similar) for it.
I do not have any experience with the Orion...
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