I use only CHI products for my own hair (pomade, hairspray, shampoo, conditioner...though I do use Paul Mitchell Skinny Serum and pomade once in awhile xD)
I love CHI because there was a time when I dyed my hair constantly, bouncing from one spectrum to another and my hair was FRIED >.< after trying a ton of different shampoos and conditioners my hair dresser recommended that I use this CHI shampoo formulated for colour treated hair specifically and it ROCKED (I've since moved onto a different kind but still CHI through and through

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Faerie, look into Paul Mitchells skinny serum...you use an itty bitty bit after you towel dry your hair and then you blow dry the hair and it makes it so luscious and soft!!
I don't wash my hair everyday, if you colour your hair at all its especially damaging to remove the natural oils everyday (now if you're getting grimey or sweaty like Rowan said...then you should probably wash it xD)