Yes very useful. Yes Telrad is the best. Rigel is more compact which makes it better suited to smaller scopes. Telrad is not very heavy but bulky. Better optically than Rigel. For 10" or larger Telrad is the way to go IMO/E. (I have both and have used most other 1x finders.) I recommend you get a right-angle 8x50 finder to go with it if you haven't got one already.
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