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There is a set of Leica binos in buy / sell. They would be good as long as they have warranty.
The Delta are very good and compare or are better than $1000 binos. They are a little heavy, but if we...

Yes. Even in high grade binos a 50mm objective will be better in poor light than a smaller objective, although in high grade binos the difference will be less noticeable
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Better light gathering. A 10x bino should have a 70mm objective. Night Binos are commonly 8x56 ( 7mm x 8 = 56 )
The Delta are optically very good. The only negative is that they require more focus...

At the $500 price point, the Delta would be the best then 'for a few dollars more' the Geko - NZ GR Hunts