Is the Guess GU7908 polarized?

No. The lenses are gradient plastic with a UV400 claim, but they are not polarized, so glare off water and roads is only partly cut.

What face shapes does it suit?

The square full-rim shape is listed for round, oval and inverted-triangle faces. The 52mm lens width and 20mm bridge are a common medium fit.

How dark are the lenses?

The listing gives both Category 2 and Category 3 tint ratings, which is inconsistent. Treat it as a medium-dark lens suited to everyday sun, not extreme brightness.

What comes in the box?

The pair is described as ready to wear right out of the case, so a case is included. Check the store listing for cloth or pouch details.

Is it worth it over a cheaper no-name pair?

You pay for the Guess name and the square designer shape. If you need polarized lenses or very dark tint, a sport or polarized pair is the better buy.