Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Brightness: Full
Text size:50%, bold On.
Sound (how loud): Maybe 75%? Usually on mute, but turned it on a few times lately purely for entertainment; I really like the "ding" that sounds like it was taken from a minute repeater mechanical watch.
Haptic (how strong): Full strength
And if you're using the prominent alert: Almost all the time. Started with it "off" but switched it on when I couldn't tell whether it tapped me or it simply bounced around.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.