I use the WGRS without the aperture or with a Twilight aperture and a Firesight front sight (see
Peep and Firesights in the FAQs), it works great for any legal daytime hunting light, dusk or dawn, optics aren't legal here during muzzleloader season, that's my preferred combination and has worked for as long as they've been available, before Firesights I used the ivory tipped front sights, but Firesights are much better.
FWIW, the Smith buckhorn is too close for old eyes to use, it's just a blur, the ladder works fine tho.
Tim