Remarkable. Easy on, easy to sight in, easy to get used to. My new favorite sight.
Great - easy to read, really durable design. Mounted on all my weapons except long ranges - and I'm completely satisfied. Will need to machine custom dovetails to fit IMI Jericho and CZ75
Works great on Keltec Sub-2000 with elevated Picatinny rail mount.
Perfect sight for the money
Most of my shooting is with air rifle. Many of the high end guns are absent open sights. I have been looking for a way to put open sights on such guns. I would go with a Williams aperture sight, which I normally prefer, but that still leaves the problem of the missing front sight. I could employ some type of holographic unit but to me that's not really an open sight, and then batteries are required. The SEE All solves the equation.
I installed it on a Diana 430L; I bought myself for Xmas. My 60 year old 20/30 vision can keep 1/2 groups from 50". That's with no practice using the See All. It's also a little better than average for me when using convention iron sights.
I bought both the tritium and non-tritium versions of the Mk2. Unless you shoot in very low light conditions the tritium is not necessary as the non tritium seems to work well into twilight. After using both, I seem to achieve better results with the delta image than the crosshair, but with more use that may change. I had no difficulty finding a zero.
I think the reviewer that said "Dim and blurry even in bright conditions" should consider a trip to the eye doctor, there may be something wrong..
It's likely I'll be back for more.