I've been using the gray brown tint for 2 weeks now.

Application : It is a little difficult to apply at first. If you mess up you can clean up your line easily with a wet cotton swab. I like to clean the brush and the top of the bottle so it doesn't clump up.

Shade : i wish it was a little gray-er/taupe, to go with my blonde hair. It is a little warmer than the sample picture above. It's more brown.

Wear : I applied for 2 hours and the color was definitely light, but still lasted 2-3 days. I applied overnight and it lasts 3-5 days. it even stays on through cleansing oils.

All-in-all: 4 out of 5. Could be a little easier to apply and a smidgen gray-er.