This mask made me curious because it looked so fun using it. And because it's kose, the Japanese brand that is trusted and their products have gotten a lot of good, even excellent reviews.
I bought this last month and use it one week once. It's thick, smells a bit plastic-y but maybe it's just my nose. spreads very smoothly but it stays on your hands so you have to wash it off. And remember to brush your hair away from your face because the mask is sticky when wet. What is a little bit hard is to apply the mask not too thick or not too thin. Also, be careful when spreading the mask near the eye area and hairline.
I usually waited for 15 minutes and peel them off up the face (to prevent premature sagging), it's not as harsh, it's quite gentle even for my sensitive skin, which is a relief. The effect is almost instant, less visible pores, brighter face, and less significant acne scars :) I don't know about this pulling out blackheads/whiteheads because I couldn't quite see it. So I'll say this is more to brighten and to fade acne scars.
Overall, a really nice product to try. Really effective as well