What kind of shooting do you do with your Sig, or what type of situation would you think a pistol with a red dot would be most effective?
Well, mine has all been at a range.
And fairly mundane and placid sorts of ranges.
And, I'm thankful for that, too.
I've had, some experience with tachypsychia, tunnel vision, and the like (0/10, cannot recommend). And I have had some CQB training (enough to have strong opinions on only bringing a pistol to a gunfight*)..
So, what the dot on a pistol--for me--does is is bring to a handgun some of what having a dot on a carbine does. I can focus on situational awareness, and not on weapon specifics. As a far smarter person than I pointed out "Put the Dot on the Danger."
Now, of course, if a person has that combination of muscle memory and repetition to where the handgun just comes up to aim on reflex, then the dot is somewhat superfluous. And, as I have learned, you co-witness handgun RDS, that dot is down in the bottom of the glass, not its center like on a carbine or rifle. This is a thing that wants practice to get accustomed to.
Now, as to speed, that Romeo Zero is "shake awake"--it's "on" as soon as it moves. So, it's there at the same time the front sight is, too.
"Shooting back" at folks on I-45? From, oh, 290 to 105, my preference would be an M1A3 Abrams, and even then, it would be a near thing (south of 290, I'd take my chances in an MV-22, thank you very much). (Spent far too much of my life commuting to Bellaire once a week [
])
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*At my age, I should be no nearer the pointy end of the spear than Regiment or Brigade HQ, but, being stubborn, would probably have a sidearm there, too. My notion of a "fair" gunfight runs to finding a Major to direct a Company to go suppress a given hostile with suitable offensive fires.