I’ve been running my Eee mostly on 30% brightness level. I’m not too fond of screens that are very bright. I feel I’d be straining my eyes more, and I fear that I’d be wearing out my LCD’s LED faster if it’s always on full. Of course there’s the issue of battery life, but with the Asus Eee using LED rather than fluorescent lamps for illumination, I think this would be just a small issue.
I just increase brightness to full or near-full when the need arises, such as when using my Eee in daylight outdoors (very rare cases) or when I’m using it amid glare (near windows or with very bright bulbs overhead).
What’s your brightness preference?