The design on these glasses are indeed quite amazing, and even though it feels rather geeky to have a pair of those, they don't look bad at all!
Personally I don't really think that it's worth your money, unless you game a LOT, and you care a lot about your eyes. If I was a professional gamer, i would probably consider having a pair aswell, if I was famous enough I might even get paid to wear them on tournaments and such (as it would be like advertising the glasses...). Another thing that makes me think that it's not worth it, is the fact that there is already computer software out there that does the exact same thing, and on top of that: it's free.
Some may argue that it's not going to be helping as much as a pair of glasses, but I don't really know what to believe of that... I mean, it may be so that it's not helping as much, but I'm not really sure how one would test that, as testing by yourself may not really work due to the fact that your opinion might be biased.
I don't currently have this program installed, but I have used in the past, with great success. When I was sitting by the computer a lot, and I felt that I was constnatly getting a headache by sitting at the computer for too long, I found this program, installed it: and my headaches were gone. The program in question is called F.lux, and you can download it for free on Linux/Mac/Windows here:
https://justgetflux.com/
It works in a way that, when the sun is up, your screen will be "normal", but when the sun has gone down, the screen will become yellow-ish, much like the colour of the Gunnars. You can turn it off anytime you want, but if you don't turn it off (and constantly have it on) it will do it's work automatically, as long as it's set-up correctly. It's one of those things that you never have to really think about, it just works on it's own.