I am not certain 11" screens would create such issues.
iRex may have had problems, but if I can judge from my iLiad, the iRex is nowhere nearly as well built as my current Kindle DX, or most Apple products.
With a sufficiently rigid shell, an extra inch shouldn't be a huge issue. It seems there is a
15" LCD NVIDIA tablet lurking around, as well as the
15" LCD Vega Android tablet. These are a bit too large for me probably, but I am assuming they have thought about the issue.