They look like the real deal even if you're very close.

The problems that I have are that they fall off very, very frequently (possibly due to sweat). When wearing a pair, I'll occasionally get the sun in my eyes because of the space between the lens. It's a huge gap and the nose-piece pushes off your face just enough for the sun to come through.

Given that it's very cheap, (3 pairs for under $15?) I'd recommend buying this.

It does block out most of the sun and they look very much like high end glasses.