The performance of these solar-viewing glasses is only fair.
1) The aluminized Mylar filter material is definitely not optical grade (as compared to the Baader Planetarium solar viewing material).
2) The sun shows as a somewhat unpleasant cold-white disc but worse yet, there is pronounced scatter around the sun's disc, as if it is being viewed through a hazy sky.
3) The frame material is very thin and allows sunlight to pass through all around the filter cells. This makes for an annoyingly bright frame that distracts from the view and makes one squint and frown while in use.
4) If you have an average size hat-size for an adult, the glasses will probably fit too snug and within a few minutes will start cutting into the contact points behind the ears. Actually, all eclipse glasses I have ever tried seem to be cut from the same template and are just as uncomfortable.
Since I'm an amateur astronomer with years of solar viewing experience, I realize that I have a higher than average expectation for this product. I do however believe that these glasses can provide a safe viewing opportunity for the passing observer.
For a better alternative: call your local welding-supply store and ask if they sell shade #15 glass welding filters (#14 is a bit too bright for viewing the sun).