Zone VI Ultralight

Has anyone used the new Zone VI Ultralight 4 x 5 camera? If so, can you tell me what you think of it? Does the shedding of its weight by 2 lbs, from 6lbs to 4 lbs, in any way compromise the camera's stability, in any and all extensions or movements? How does it compare with its competition, such as the Wisner Expedition and Pocket Expedition, for example? Do you find it easy to use? Any major complaints, etc, etc...

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I am adequately familiar with the OLD Zone VI 4 x 5, so please try to limit your responses to the Ultralight specifically.

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Thanks.