Check the rating of the glass before you observe the sun, and check carefully for any prior damage. Look for a few seconds and then look away for a little while. Also, read carefully any safety instructions that come with the glasses or are printed on them. Also, they are good for more than eclipses. Using my own black polymers, I've sometimes been able to see sunspots, dark areas of intense solar magnetism, on the sun's surface.
Most astronomical objects look flat and two dimensional.
Whatever you decide to do, please do it safely. For more information about the eclipse, including a detailed time line and a discussion of the various safe and unsafe methods for observing the sun, check out last week's column or the Perkins web site above.