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For the most part, the controls on the E-30 are pretty well laid out and easy to differentiate by feel. However, some people might find themselves tripping over the on/off switch when using the left and down navigation buttons. The programmable Fn button is useful, but rather than make the My Mode custom presets available via the mode dial or its Super Control Panel (the interactive back display), you have to assign it to the Fn button, which is frustrating if you prefer to operate with custom modes and something else assigned to the custom button.