Well, if you're going to spend that much I'd say go a little bit further and get a Telrad. Well tried and tested! Gives you a bulls-eye pattern rather than the red dot and you can adjust the brightness of the pattern easily.
As with most finders, you should try to align them first during daylight hours, when you can recognise what you're seeing. Find a distant power pole or distinct tree top to do the alignment on, then it should be easier to tweak at night.
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