Some things to think about before buying.
I have a Skinner, two XS "Ghost Ring" sights and an NECG ghost ring to compare although not all are specifically for a #1.
If you have already mounted a scope on your #1, make sure you can still remove the rearmost rib screw. It sits right between the scope mounting dovetails and if you've really cranked down on the base screw it can squeeze the rib and physically lock that screw in place, plus the screw is not made of hardened metal that I can see and the allen head strips out really easily. If it is locked in you will have to find some way to remove it before you could mount a Skinner or an XS.
The Skinner comes standard with a threaded stem which needs Skinner apertures - it can use a Williams style but only if it is cranked up enough to allow their greater diameter to clear the base. XS makes a threaded stem that you have to buy separately but it can use either Williams or Skinner screw in apertures. NECG does not offer a threaded aperture at all, you have to choose between three set diameters although one is a .210 "ghost ring" style. I like a large aperture but prefer a little more metal around it so I ended up drilling out their medium aperture to about .190 or so. They're thinking about making a threaded stem but apparently it takes a large design team and six months of contemplation to get it done, at least that's only a slightly exaggerated impression I got when I talked to someone there about getting one.
One the plus side, the NECG fits the factory scope dovetails so if that screw won't come out you can still use the NECG sight. I have their ghost ring sight on a Model 77 Hawkeye and it is a very well made sight, those side ribs don't seem to get in the way and they sure do protect that little aperture stem sticking up there. With any replacement rear sight you'll sometimes have to juggle the adjustment range and tpi of the rear with a properly sized front blade to make it all work together. Another neat thing about the NECG is that you can take it off if you want to mount a scope for whatever reason, then remount it and as long as you tighten the mounting screw so it aligns the same it comes right back to zero. I've removed mine from my 77 two or three times and it holds zero every time. A penny in the screw slot provides enough torque to tighten it down against the repeated recoil of a .30-06 so it doesn't have to be farmer tight and can still be removed easily.
The XS is a neat little arrangement and with opposing set screws for windage adjustment. By knowing their tpi count you can use simple geometry to make more precise windage adjustments than just the guess and by golly of the Skinner or NECG. But I have a bone to pick with them about those 8x40 set screws. They work, but it bugs me that they give you little slotted head screws that won't take much torque at all without getting buggered up, and you can get any size replacement allen head set screw in the world except 8x40. Again, not a big deal, just my private rant against a small flaw in an otherwise good peep sight.
They are all well made so all would give you good service, they are obviously far less susceptible to damage than a scope and lots lighter, too. Of the three, the Skinner is probably the most rugged. You'd have to hit their aperture stem with a very large hammer to even begin to damage it.
