Amber tints like the Gunnars do help with strain, they do help with clarity, they do help with glare.
This isn't some brand new concept that they invented for the sake of money. Stuff like this has been around for a while, tested and proven to work, e.g. paintball lenses. For years and years and years paintball manufacturers have made amber lenses for masks. They help you see better by improving contrast and reducing the effects of glare.
While I believe people saying that there's software that can do that to a computer screen which could make them essentially pointless, these glasses have uses outside computers. You could use these driving at night to help with the glare from oncoming headlights, for example. I know I often get headaches driving at night because of how harsh the lights are from other people's cars.