'The more painful the UI is, the more satisfied users are.'

Can a poor user interface actually be a selling point for a product?

For financial information services company Bloomberg, it can. The company's iconic data-spewing terminals offer streams of info in yellow and orange text on a black background, among other design no-nos.

But when a global design firm attempted to revamp the terminal in 2007, they discovered that Bloomberg's users were very, very attached to its poor usability.

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