I'm surprised to see how many people are actually voting on the backlit keys, I mean, I've had a g15 keyboard and also a g19 keyboard as my gaming keyboards, the g19 has an option to change the color of the backlighting, but backlighting has always been an aesthetic function for me, never really a handy function, so I'm surprised to see how many people are actually craving it.
I've been able to touch type since I was like 10-11 years old, and finding the buttons in the dark as long as you sit with your computer is not going to be a problem at all, usually the lighting from the screen would make the buttons visible too.
The only time I could see this as actually a functional upgrade would be at those rare times during the night, where you have to hit a rarely used function key while lying down, and the screen off, so that you wouldn't be able to read the stickers on the keyboard, then, it could come in handy, otherwise it's just a visual upgrade, albeit a fine one.