On a serious note, how do you use it for business??? I can't depend on my rMini for anything on Safari at the moment.
Photography... Showing people my work. It's easy to carry and big enough to make photos impressive.
The yellow tints pictures, not very visible in many situations, but with some black and white and some photos with larger areas of a single tone (eg blue + yellow starts looking a bit greenish).
But what bothers me most about the tint/darkening is reading text and books on a white page. Every single line you read goes from dark to light (or vice versa depending on how it's held). And this repeats for every line in the page. Then you go to the next page in your book and repeat... And repeat... Hard to ignore.