I've been looking for something like this forever. I've got a 5 year old monitor with a so-so graphics card, and so many of my games are always too dark! I downloaded the trial, and loved it so much that I bought it.

It's a shame they don't tell you what comes in the full-version, becuase it's the coolest part. It'll automatically detect the launch of your game, and apply the gamma settings automatically. I'd reccommend it to anybody.