I used a dry shampoo from TRESemmé until I got ahold of Pssssst! through Beauty Army, so this was not my first dry shampoo, but I like this much more than the TRESemmé product. While this is not now my absolute favorite dry shampoo, it is my second favorite, and a more economical choice for some than my top pick, which is the Oscar Blandi Pronto Dry Shampoo.
This leaves a bit of white residue, which dissipates quickly after brushing (note brushing, not combing -- combing takes forever to get rid of it!). It is best for getting rid of hair oil, and it works great for mornings where you either cannot grab a shower, or for traveling, when you want to look good upon arrival. I honestly am very happy with this product -- I just think the Oscar Blandi keeps the oil down for longer, and it has much less residue.
I definitely recommend this product, and since it is available in a great 1.76 TSA-friendly size, I can almost guarantee that this will be in my 1-quart less-than-three-ounce-toilettries bag again the next time that I fly!