I've not hunted with a M94 in .30-30 in years, but I bought a first generation See-All sight maybe 5 years ago. Ran a post on it on these forums as well I think?
I first put the See-All (delta reticle) on an AK clone and shot a wee bit of outlaw 3-gun with it locally. I also kept on the AK an hauled it around in the truck and ATV a bit. The sight held zero and held up, no problems. I did manage to chip the lens when I got clumsy with the rifle pulling it from the rack on my ATV, but it did not effect function or zero. In 3-gun, the sight was fast and accurate enough for the big cardboard plate targets (12"+?) up close, inside 50 yds. Out at 100, it was still possible to shoot acceptable groups on pie plate size targets. But I would say without reservation that a precision/distance sight the See-All is not. I could shoot a real peep/aperture sight much better, especially past 100 yds.
The first gen sight is a bit clunky, the shape far too blocky and edges too severe, and the "slide on" attachment design was not convenient. There was a lot of frame material there that did not need to be. I actually wrote See-All a letter (pen and ink!) commenting on slimming down the gen 1's and making the attachment system more practical. Whether my letter carried any weight is debatable, but the second gen sights are much more trim and rounded. The attachment system is more refined as well.
The gen 1 See-All next went on my turkey gun last season, and I believe the unit has found a home. Clamped onto the top of my vintage 870 via a saddle type mount, it sets way too high and required a redneck Monte Carlo stock mod (foam rubber and camo duct tape) to raise my cheek weld high enough to aim consistently. So modified, I proceeded to shoot 4 gobblers with it, at distances from 24 to 40 yds. I found the See-All visible under all possible lighting conditions in which one could legally shoot with no problem. I could see the See-All MUCH better than the factory iron sights on the slug barrel (onto which I screw a turkey choke!) And, as advertised, no batteries needed, ever, and no way moisture is going to fog or short circuit the unit, ever.
I like the sight, and may buy another for on my HiPoint 10mm carbine, which also has about the same limited range as a shotgun.