I have had both. Opus is not quite as detailed, not nearly as dynamic in either base or mod form. GNSC Opus might be more musical at the expense of detail and air. For the money, gnsc Opus is hard to beat. If you have the cash, I preferred the X03SE. If you need to run direct and need more cash, GNSC Opus is a no brainer. You will lose about 5-10% in dynamics, air, detail imho.
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