Didn't do it for me. Is really bad compared to Batiste! Too white, didn't soak up any of the oiliness on my roots. Eventually I just tossed it (and that says a lot, I almost never toss beauty products!).
My hair is oily (thick, frizzy, a bit wavy) and I don't want to wash it every day. This why, dry shampoos are a good solution.
I have used only 2 other brands so far (from Sephora and SwissoPar) and from the three I prefer TiGi.
It leaves an amount of white stuff on your hair, but I believe it is not noticeable because after I use it I comb my hair. And if I spray too much I just use my hand to remove the excess. I don't think it would be suitable for a person with very dark hair. And be careful, your hair will not be shiny anymore (natural or oil shine).
The reason I like is that it gives volume to the roots, a thing that the other dry shampoos didn't do. But it also leaves the hair harder to comb and arrange. It's a similar feel with the hairspray.
I feel like I can't use it more than once. It would be too much buildup and I love the feeling of smooth clean hair.
Another thing that I have noticed is that even when I have very oily hair and I apply the shampoo, the following day the hair doesn't look oily either. I feel it's dirty, but it's ok to go out. Maybe not to work or school, but for some shopping it will suffice.
Bottom line: I like using it, didn't have any bad reaction to it, but don't expect magic to happen. Your hair will look ok for a day maybe two, but nothing work as a good bath and some real shampoo. It's just something you add to your hair to soak up the oil.