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Acer is clear the A100 is primarily to be used in portrait, although it works fine in all four orientations. Even the packaging shows the tablet used in portrait.
Acer has retained a stock Honeycomb UI including the home screen.
The 7-inch form factor is used comfortably in landscape as shown, or portrait. All 4 orientations are supported. The screen auto-rotates when the device is rotated.