All it did for me was put an ad on the right side and scrunch down the reading area. See attached pic.
Using google chrome on a 22" monitor if that matters.
Looks like I have the same issue going as Bossman. -
21" Screen w/ Google Chrome
5.75 inches of Black&White Stripes on the left (27.4%)
5.75 inches of Black&White Stripes on the right (27.4%)
2.00 inches for Williams PenaltyCard.com (Almost 10% of page)
7.00 inches for Refstripes (Only 29% of the page)
0.25 inch border between Refstripes and B&W stripes on the left
0.25 inch border between Williams and B&W stripes on the right
29% of the display for your actual web pages
70% of the display is not your website
For what its worth, I have an I-Phone 6 and it appears the display has more of the appearance that they told you it would.
I hope this helps