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$300 USD for a 3x magnifier like that is a decent deal.
They are useful if you have a rifle set up for CQB with a red dot or holosight but you may also want to use it at longer ranges. I have a rifle with an Aimpoint CompM4 and the Aimpoint magnifier... they together aren't as good as something like an ACOG or telescopic sight for long range precision, but the magnifier adds some flexibility to a rifle otherwise intended for closer ranges.
Mixing brands between the optic and magnifier is fine- the only thing you will need to make sure of is that the height is close enough for the magnifier to be magnifying the appropriate part of the optic's field of view.
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