Four SCENE mode buttons automatically power on the appropriate components and make system adjustments for specific entertainment options.

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Garmin's concept positions the screen higher up on the dash in the driver's eyesight and combines it with a rotary infrared controller in convenient reach, a touch pad, and menu mode buttons.

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In touch mode, buttons and menus are spaced farther apart to reduce the chance of accidentally hitting the wrong one.

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The Flex tracks your sleep quality as well, but the approach here differs from other Fitbit products: whereas the Fitbit One and Fitbit Zip have a key you can press to enter sleep mode, the Flex has no buttons at all, so your only recourse for logging sleep is to use the app or website.

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Both options feature lens-mounted zoom toggles, pop-up flashes and dedicated video capture buttons, but only the P520 offers a dedicated mode dial, and if you're planning to make changes on the fly, that's really a necessity.

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During their test drive, the team at Trusted Reviews found the device to work quite well -- mostly due to its 2, 000dpi laser sensor -- although they thought that the top-mounted buttons were somewhat difficult to access, and joystick mode can't be used to manipulate the Z-axis.

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Volume buttons on the remote offer a convenient way to control audio while private listening mode is in use.

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Top-mounted exposure compensation and mode dials are strategically placed for simple access and operation, while custom function and AEL buttons on the back panel are also easily accessible.

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