They aren't the most comfortable shoes, but they are indeed lightweight.  They're not uncomfortable, but they're just....meh.  The shoe is more than roomy enough, which is fine, but the toe box width seems a little wider than it needs to be.  And there isn't a ton of arch support, so as a result, when you are walking or jogging downhill, it feels like your foot is sliding forward slightly.  In spite of that, I ended up keeping them, because I needed shoes in a hurry and didn't have time to look elsewhere.  I pulled out the insole and replaced it with Dr Scholl's Sport Insoles, which help a little in terms of comfort and arch support.  The insoles that came pre-installed had no arch support and were almost 100% flat.

On the bright side, they look great.  I always hate loud "girl color" shoes on the market, and these are sleek and neutral.  The white doesn't get filthy that quickly, but I'm mostly on concrete.

Bottom line: these are adequate shoes, but not great shoes.  For the price, they're fine, and good enough to get by with.  The light weight is the real selling point, but I don't know if I'd buy this same shoe again in the future.
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Update:
After only 3 months of use, the shoe is already falling apart.  And NOT from hardcore usage. I walk/jog ~1.5 miles/day on flat, smooth concrete:

(90 days) x (~1.5 miles) = approximately 135 total miles of light walking/jogging.

Most modern running shoes should last between 300-500 total miles.  This shoe lasted 1/3 as long as it should have.  That should shock you.
The major issue is that the area that covers the toe box is an extremely flimsy mesh.  So it has already developed a hole where the mesh meets the solid material at the tip of the toe.  You can't tell from the product images, because the mesh is black and the interior of the shoe is dark. But if you held it up to the light or a window, you'd be able to see right through the entire top of the shoe, since the mesh is so flimsy.  (The upside of this is that the mesh is very, very breezy.  The downside is that you can never wear this shoe in a rainstorm, or when you are splashing through puddles, because it's like screen doors on a submarine.

These shoes were a giant disappointment.  If they'd even lasted 300 miles, I'd have been fine with it.  But to only make it to 135 miles is laughable.