Once I chamber a round, my pistol does not leave my sight.
And I never carry without a round chambered.
So I really don't see the need to press-check.
It sounds a little too OCD in my opinion.
True, it is OCD usually.
But it is a consistancy of training issue. The more I press check the more natural it becomes.
The real reason for press checking is after fireing off some rounds ducking behind cover. Deciding to make a run for it, either away from the threat, or towards to protect someone.
Chamber checking before you make that move. Because once you move you'll have all thier attention and very little time to act.
So you'll see me chamber check sometimes, sometimes with a tac reload, from behind cover during a run&gun comp/training, before moveing to the next spot.
It's just a consistancy and training thing most of the time. For example I never just load my CCW and spare mags. I turn that loading time into a quick practice to get my mindset right, and to burn in the seriousness of my decision to carry.
Loading my CCW goes like this:
-Draw, point, aim, relax.
-Load mag from my mag pouch just like a speed reload.
-chamber check
-hammer punch back of slide to make sure it's in battery
-safety on, reholster.
-load another mag and put it in my mag pouch
Just a weird thing I do, but press checking which felt weird a couple years ago is perfectly natural now.
As if it ain't obvious, I copy alot of technique and mindset from these guys:
http://www.bravocompanyusa.com/Magpul-Dynamics-Dynamic-Handgun-dvd-p/magpul dvd dyn 004.htm
I haven't been topping off my mag unless it's a capacity challenged 1911. I like haveing a place to stick that round should I need to set the gun down in my room at a hotel or something with an empty chamber. I travel too much.