There is no 'Perfect' size, shape or weight, because, as shown by the replies, we all are different in size, shape and physical abilities.
(I mostly read while lying down)
My PEz is light... But I use it in a case (more weight, but still fairly light), which allows me to hold it one-hand and still use the page turn jog wheel.
My K4NT is also in a case. For similar reasons. Hold it one-handed. The difference (and reason I still prefer the PEz), Location of 'forward'. I have Big Hands (XL glove), the button is not in the 'optimum' location for me.
My TAB2 is (already) heavy and awkward to hold in such a way to not get false operations.
My 2cents, there will always be a market for a variety of configurations/models
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