I have just read that they just filter the blue spectrum of the light emitting from the display and thus have a relaxing effect on the eyes. Plus they have a 0.2 magnitude effect, so you can read smaller texts better. Hype or not, it is all subjective.
Some people describe headache after using those, some are annoyed by the reflecting light on the inner of the glasses. Others report positive results while gaming or working. Maybe I will get a pair someday when I get to work in an office.