My LED's have a significant amount of variance. I have a set of GGG Electric Ice 2's with RGB, some colors are fine while others are way off in relation to each other. When set to White (The worst color for my LEDs), some are showing white, some purplish, and one shows pinkish. Other light colors like yellow are off as well.
Another idea you might want to consider, don't know how feasible it is: Perhaps a utility that gives you a slider, and lets you set each color by sliding it and hitting "Set". The slider would just change the intensity values for each RGB channel as it is slid. Tweaking the default values is a bit time consuming, I tried to reset Orange and Brown a couple of weeks ago and resorted to tweaking values, relaunching LEDWiz, then finding a game that had Orange or Brown buttons and launching it, and repeating until I found a setting I liked. Colors are subject to variance between LED sets, and user's vision, so IMO it would be a really nice feature.