I've used TIGI products since I was a teen, and I find them really, really not worth the money. :/ They're okay for a while, but my hair at least gets really greasy when I use them for a longer period of time. And in the summer when it's hot I used to have to wash my hair every morning if I wanted it to look clean. Otherwise, since of all the sweating, my hair would be a disgusting mess after just one night's sleep (and my pillow would smell like, well, pretty awful).
I've gone to using Kerastase these days.