So I’m still (obviously) throwing content at this thing. But my initial impressions of the new iris settings are as follows:
I’m a big fan of the low iris setting. It’s not as aggressive and so doesn’t result in the same level of contrast/blacks as the middle or high setting but I have yet to see a single occurrence of iris pump/flicker even in the most challenging material. I therefore consider this a ‘free’ upgrade as you get a nice improvement in blacks/contrast with seemingly no downside. I can’t imagine even the pickiest viewers finding fault in this mode.
The middle iris setting gets a you a discernible increase in blacks/contrast but at the cost of some visible iris intervention. The middle setting seems to be the closest in performance to the prior ‘ON’ setting but without some of the former issues. For those that are catching up the prior iris firmware had a tendency to get flummoxed with high APL (bright) content resulting in a sort of seesawing action from the iris. This ‘flicker’ or pumping is largely absent in those scenes that caused the prior firmware fits. I think the middle iris setting will be popular as it offers excellent contrast performance that I doubt many viewers will find distracting.
The same can’t be said for the high setting. To my eye the high setting doesn’t offer much if any improvement in contrast/blacks over the middle setting. Even if it did the constant, visible iris intervention leaves it all but unusable for me.
What to do if you find yourself stuck with no hope of rescue:
Consider yourself lucky that life has been good to you so far. Alternatively, if life hasn't been good to you so far, which given your present circumstances seems to be more likely, consider yourself lucky that it won't be troubling you much longer...
-- Excerpt from the Hitchhiker's Guide to the Galaxy.