I put the One Hole ghost-ring sight on my Ruger Super Blackhawk Bisley, .480 Ruger. Makes a world of difference on quick and accurate sight acquisition.
I bought a set for the 7.5" SBH 41 mag. Either aperture worked for me. But it was just an experiment and a learning tool.
The revolver is now equipped with the original Ruger blade.
I found the aperture quicker to acquire, but less precise than the factory sight.