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I'm a bit disappointed, because it renders relative widths according to the current window width, which would be much smaller on smaller screens.

Many of my webpages have something like

width: 80% max-width: 80em

or so for the main text. Which ensures that on a narrow window you still see a decent part of the main text, but on this test site it looks as though you only see the margin with a narrow browser window.

This tool is misleading. It sizes the site according to your CURRENT browser size then lays the semi-transparent graphic over it. This means that if I have a 900px wide content area centered in the viewport, and my current width browser width is 1400px, it appears that there is 250px of empty background on the left and a 380px wide browser would see almost nothing. That's inaccurate.

tl;dr: take this tool with a grain of salt, resizemybrowser is a much better method.

Unfortunately, it's not too useful for websites in right-to-left languages, like Persian, Arabic and Hebrew.

Simple and pretty laggy for me on chrome - even moving the mouse seems to lag a little.