Opinions on these tux trousers

If they're black and they fit, I say go for it. Just remember that a finished waistband does not give you permission to forgo a cummerbund.

A white dinner jacket ( which is generally a country club or tropical climate or cruise ship thing ) is worn with black tux pants.

You'd have a hard time taking a picture of these pants that was less informative than the pictures above. If they are black, the pictures are incredibly overexposed. And the pictures tell nothing of fit. They only prove that they are probably tuxedo pants.