As far as I know SIG was the first to market scopes with electronic internal anti-cant indicators. Now Leupold is offering it on a VX6 model or two. I think this is an important advance for long range hunters as even a small cant has large consequences at long ranges. Hopefully within a very few years this will be part of every illuminated scope. I say this because using my bubble levels is such a PITA. One of the good things about these electronic anti-cant indicators is that they are supposed to be more accurate than a bubble level. But the best thing is see about these new "levels" is that it is a constant reminder to shoot from a level rifle. SIG has taken things another step up with its "Electro-Optics" Bluetooth connection between their rangefinder and some scope models that are equipped with a series of lighted hold over dots on the vertical crosshair. Yeah, the Burris Eliminator scopes have this built in, and now with up/down angle compensation to boot. So SIG is merely giving is the same thing but with a separate dedicated rangefinder to help. ?? Will we see scopes and rangefinders with all the sensors and programming of a Kestrel 5700 including a hat-mounted airspeed impeller? (Better keep all your pricey electronic shooting aids in your lead shielded safe so a nuclear EMP burst doesn't disable them come the apocalypse.) ;o) Eric B.