I prefer the Skinner front sight to the XS one, as it is finer. I don't have any experience with Skinner's rear sights, though.
I have a Winchester Model 62A pump .22 with a Marbles tang sight. I first tried the XS front sight and I found that it is fairly coarse for plinking at one of my favourite targets: fired shotshells.
My Skinner front sight came with a height of .645" from top to dovetail bottom. I knew I wanted about a .500" tall sight, so I scribed a line on both sides, made a rough cut using a Dremel with a cutoff wheel, and finished up with a file. I then touched it up with cold blue.
That said, I can definitely see the XS as being a potentially a very good setup for big game at close ranges. The white stripe should work well in low light. They can be had from either The Shooting Edge or Brownell's.
Skinner sights are ordered directly from the maker and the price includes shipping, even to Canada.
With a peep sight, a square post is much better than a bead, as the eye naturally wants to center the bead in the aperture. I find that this makes it difficult to aim the rifle such that the point of impact sits on top of the front sight, rather than covering the point of impact. You may also find that a different front sight height is needed to zero the peep sight.
Unfortunately, neither XS nor Skinner make a rear sight for the Winchester 1895.